Endurance International 10-K 22 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Feb. 20, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	Endurance International Group Holdings, Inc.
Entity Central Index Key	1,237,746
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Trading Symbol	EIGI
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		141,618,231
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 515,396,394

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 66,493	$ 53,596
Restricted cash	2,625	3,302
Accounts receivable	15,945	13,088
Prepaid domain name registry fees	53,805	55,444
Prepaid expenses and other current assets	29,327	28,678
Total current assets	168,195	154,108
Property and equipment—net	95,452	95,272
Goodwill	1,850,582	1,859,909
Other intangible assets—net	455,440	612,057
Deferred financing costs	3,189	4,932
Investments	15,267	15,857
Prepaid domain name registry fees, net of current portion	10,806	10,429
Other assets	2,155	3,710
Total assets	2,601,086	2,756,274
Current liabilities:
Accounts payable	11,058	16,074
Accrued expenses	79,991	67,722
Accrued interest	24,457	27,246
Deferred revenue	361,940	355,190
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	7,630	6,690
Deferred consideration—short term	4,365	5,273
Other current liabilities	4,031	2,890
Total current liabilities	527,417	516,785
Long-term deferred revenue	90,972	89,200
Notes payable—long term, net of original issue discounts of $25,853 and $25,811, and deferred financing costs of $43,342 and $37,736, respectively	1,858,300	1,951,280
Capital lease obligations—long term	7,719	512
Deferred tax liability—long term	19,696	39,943
Deferred consideration—long term	3,551	7,444
Other liabilities	10,426	8,974
Total liabilities	2,518,081	2,614,138
Redeemable non-controlling interest	0	17,753
Commitments and contingencies (Note 16)
Stockholders’ equity:
Preferred Stock—par value $0.0001; 5,000,000 shares authorized; no shares issued or outstanding	0	0
Common Stock—par value $0.0001; 500,000,000 shares authorized; 134,793,857 and 140,190,695 shares issued at December 31, 2016 and December 31, 2017, respectively; 134,793,857 and 140,190,695 outstanding at December 31, 2016 and December 31, 2017, respectively	14	14
Additional paid-in capital	931,033	868,228
Accumulated other comprehensive loss	(541)	(3,666)
Accumulated deficit	(847,501)	(740,193)
Total stockholders’ equity	83,005	124,383
Total liabilities, redeemable non-controlling interest and stockholders’ equity	$ 2,601,086	$ 2,756,274

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Unamortized deferred financing costs	$ 25,811	$ 25,853
Unamortized original issue discounts	$ 37,736	$ 43,342
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	140,190,695	134,793,857
Common stock, shares outstanding (in shares)	140,190,695	134,793,857

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenue	$ 1,176,867,000	$ 1,111,142,000	$ 741,315,000
Cost of revenue	603,930,000	583,991,000	425,035,000
Gross profit	572,937,000	527,151,000	316,280,000
Operating expense:
Sales and marketing	277,460,000	303,511,000	145,419,000
Engineering and development	78,772,000	87,601,000	26,707,000
General and administrative	163,972,000	143,095,000	81,386,000
Transaction costs	773,000	32,284,000	9,582,000
Impairment of goodwill	12,129,000	0	0
Total operating expense	533,106,000	566,491,000	263,094,000
Income (loss) from operations	39,831,000	(39,340,000)	53,186,000
Other income (expense), net
Other income (expense), net	(600,000)	1,862,000	5,440,000
Interest income	736,000	576,000	414,000
Interest expense	(157,142,000)	(152,888,000)	(58,828,000)
Total other expense—net	(157,006,000)	(150,450,000)	(52,974,000)
Income (loss) before income taxes and equity earnings of unconsolidated entities	(117,175,000)	(189,790,000)	212,000
Income tax expense (benefit)	(17,281,000)	(109,858,000)	11,342,000
Loss before equity earnings of unconsolidated entities	(99,894,000)	(79,932,000)	(11,130,000)
Equity income (loss) of unconsolidated entities, net of tax	(110,000)	1,297,000	14,640,000
Net loss	(99,784,000)	(81,229,000)	(25,770,000)
Net loss attributable to non-controlling interest	277,000	(15,167,000)	0
Excess accretion of non-controlling interest	7,247,000	6,769,000	0
Net loss attributable to non-controlling interest	7,524,000	(8,398,000)	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.	(107,308,000)	(72,831,000)	(25,770,000)
Comprehensive loss:
Foreign currency translation adjustments	3,091,000	(597,000)	(1,281,000)
Unrealized gain (loss) on cash flow hedge, net of taxes of $46, ($792), and $11 for the years ended December 31, 2015, 2016 and 2017	34,000	(1,351,000)	80,000
Total comprehensive loss	$ (104,183,000)	$ (74,779,000)	$ (26,971,000)
Net loss per share attributable to Endurance International Group Holdings, Inc.—basic and diluted (in usd per share)	$ (0.78)	$ (0.55)	$ (0.20)
Weighted-average number of common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.—basic and diluted (in shares)	137,322,201	133,415,732	131,340,557

Consolidated Statements of Ope5

Consolidated Statements of Operations and Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Unrealized gain (loss) arising during period, tax	$ 11	$ (792)	$ 46

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance, (in shares) at Dec. 31, 2014		130,914,333
Beginning balance at Dec. 31, 2014	$ 174,496	$ 14	$ 816,591	$ (517)	$ (641,592)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted shares (in shares)		838,809
Vesting of restricted shares	0
Exercise of stock options, (in shares)		185,343
Exercise of stock options	2,224		2,224
Other comprehensive loss	(1,201)			(1,201)
Net loss attributable to non-controlling interest	0
Net loss attributable to Endurance International Group Holdings, Inc.	(25,770)				(25,770)
Stock-based compensation	29,925		29,925
Ending balance, (in shares) at Dec. 31, 2015		131,938,485
Ending balance at Dec. 31, 2015	179,674	$ 14	848,740	(1,718)	(667,362)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted shares (in shares)		2,458,886
Vesting of restricted shares	0
Exercise of stock options, (in shares)		396,486
Exercise of stock options	2,564		2,564
Other comprehensive loss	(1,948)			(1,948)
Non-controlling interest accretion	(30,844)		(30,844)
Investment in Constant Contact	5,395		5,395
Net loss attributable to non-controlling interest	(15,167)		(15,167)
Net loss attributable to Endurance International Group Holdings, Inc.	(72,831)				(72,831)
Stock-based compensation	57,540		57,540
Ending balance, (in shares) at Dec. 31, 2016		134,793,857
Ending balance at Dec. 31, 2016	124,383	$ 14	868,228	(3,666)	(740,193)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted shares (in shares)		5,040,609
Vesting of restricted shares	0
Exercise of stock options, (in shares)		356,229
Exercise of stock options	2,049		2,049
Other comprehensive loss	3,125			3,125
Net loss attributable to non-controlling interest	277		277
Net loss attributable to Endurance International Group Holdings, Inc.	(107,308)				(107,308)
Stock-based compensation	60,479		60,479
Ending balance, (in shares) at Dec. 31, 2017		140,190,695
Ending balance at Dec. 31, 2017	$ 83,005	$ 14	$ 931,033	$ (541)	$ (847,501)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (99,784,000)	$ (81,229,000)	$ (25,770,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation of property and equipment	55,185,000	60,360,000	34,010,000
Amortization of other intangible assets from acquisitions	140,354,000	143,562,000	91,057,000
Amortization of deferred financing costs	7,316,000	6,073,000	82,000
Amortization of net present value of deferred consideration	632,000	2,617,000	1,264,000
Amortization of original issuance discount	3,860,000	2,970,000	0
Impairment of other long-lived assets(4)	18,731,000	9,039,000	0
Impairment of investments	600,000	0	0
Impairment of goodwill	12,129,000	0	0
Stock-based compensation	60,001,000	58,267,000	29,925,000
Deferred tax expense (benefit)	(22,807,000)	(113,242,000)	7,120,000
Gain on sale of assets	(315,000)	(243,000)	(155,000)
Gain from unconsolidated entities	(110,000)	(1,862,000)	(5,440,000)
Loss of unconsolidated entities	0	1,297,000	14,640,000
Financing costs expensed	5,487,000	0	0
Loss on early extinguishment of debt	992,000	0	0
Dividend from minority interest	100,000	100,000	0
(Gain) loss from change in deferred consideration	0	(20,000)	1,174,000
Changes in operating assets and liabilities:
Accounts receivable	(3,102,000)	(1,620,000)	(1,659,000)
Prepaid expenses and other current assets	4,383,000	(4,932,000)	(13,187,000)
Accounts payable and accrued expenses	9,386,000	19,458,000	9,926,000
Deferred revenue	8,235,000	54,366,000	34,241,000
Net cash provided by operating activities	201,273,000	154,961,000	177,228,000
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	(889,634,000)	(97,795,000)
Purchases of property and equipment	(43,062,000)	(37,259,000)	(31,243,000)
Cash paid for minority investment	0	(5,600,000)	(8,475,000)
Proceeds from sale of assets	530,000	676,000	284,000
Proceeds from note receivable	0	0	3,454,000
Purchases of intangible assets	(1,966,000)	(27,000)	(76,000)
Net (deposits) and withdrawals of principal balances in restricted cash accounts	677,000	(557,000)	50,000
Net cash used in investing activities	(43,821,000)	(932,401,000)	(133,801,000)
Cash flows from financing activities:
Proceeds from issuance of term loan	1,693,007,000	1,056,178,000	0
Repayment of term loan	(1,797,634,000)	(55,200,000)	(10,500,000)
Proceeds from borrowing of revolver	0	54,500,000	147,000,000
Repayment of revolver	0	(121,500,000)	(130,000,000)
Payment of financing costs	(6,304,000)	(52,561,000)	0
Payment of deferred consideration	(5,433,000)	(51,044,000)	(14,991,000)
Payment of redeemable non-controlling interest liability	(25,000,000)	(33,425,000)	(30,543,000)
Principal payments on capital lease obligations	(7,390,000)	(5,892,000)	(4,822,000)
Proceeds from exercise of stock options	2,049,000	2,564,000	2,224,000
Capital investment from minority interest partner	0	2,776,000	0
Net cash provided by (used in) financing activities	(146,705,000)	796,396,000	(41,632,000)
Net effect of exchange rate on cash and cash equivalents	2,150,000	1,610,000	(1,144,000)
Net increase in cash and cash equivalents	12,897,000	20,566,000	651,000
Cash and cash equivalents:
Beginning of period	53,596,000	33,030,000	32,379,000
End of period	66,493,000	53,596,000	33,030,000
Supplemental cash flow information:
Interest paid	141,157,000	119,063,000	57,338,000
Income taxes paid	3,369,000	4,278,000	4,510,000
Supplemental disclosure of non-cash financing activities:
Shares or awards issued in connection with acquisitions	0	5,395,000	0
Assets acquired under capital lease	$ 15,536,000	$ 0	$ 9,795,000

Nature of Business

Nature of Business	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Nature of Business Formation and Nature of Business Endurance International Group Holdings, Inc. (“Holdings”) is a Delaware corporation which together with its wholly owned subsidiary company, EIG Investors Corp. (“EIG Investors”), its primary operating subsidiary company, The Endurance International Group, Inc. (“EIG”), and other subsidiary companies of EIG, collectively form the “Company”. The Company is a leading provider of cloud-based platform solutions designed to help small- and medium-sized businesses succeed online. EIG and EIG Investors were incorporated in April 1997 and May 2007, respectively, and Holdings was originally formed as a limited liability company in October 2011 in connection with the acquisition by investment funds and entities affiliated with Warburg Pincus and Goldman, Sachs & Co. on December 22, 2011 of a controlling interest in EIG Investors, EIG and EIG’s subsidiary companies. On November 7, 2012, Holdings reorganized as a Delaware limited partnership and on June 25, 2013, Holdings converted into a Delaware C-corporation and changed its name to Endurance International Group Holdings, Inc.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Preparation The accompanying consolidated financial statements, which include the accounts of the Company and its subsidiaries, have been prepared using accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany transactions have been eliminated on consolidation. Segment Information From the fourth quarter of fiscal year 2016, through the third quarter of fiscal year 2017, the Company had two reportable segments, web presence and email marketing. The Company has experienced significant changes in its management structure during fiscal year 2017, including a change in its chief executive officer, who is the Company's chief operating decision maker ("CODM"). The Company's leadership structure has been revised to centralize management of certain domain-leading brands in order to improve overall performance. As a result of these management changes, management has revised internal financial reporting structures, and broken the former web presence segment into two reportable segments, web presence and domains. The Company's third reportable segment, email marketing, remains unchanged. The products and services included in each of the three reportable segments are as follows: Web Presence . The web presence segment consists primarily of the Company's web hosting brands, such as Bluehost and HostGator, and related products such as domain names, website security, website design tools and services, and e-commerce products. Domain . The domain segment consists of domain-focused brands such as Domain.com, ResellerClub and LogicBoxes as well as certain web hosting brands that are under common management with domain-focused brands. This segment sells domain names and domain management services to resellers and end users, as well as premium domain names, and also generates advertising revenue from domain name parking. It also resells domain names and domain management services to the web presence segment. Email Marketing . The email marketing segment consists of Constant Contact email marketing tools and related products and the SinglePlatform digital storefront solution. The Company's segments share certain resources, primarily related to sales and marketing, engineering and general and administrative functions. Management allocates these costs to each respective segment based on a consistently applied methodology. Use of Estimates U.S. GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets, liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates, judgments and assumptions used in preparing the accompanying consolidated financial statements are based on the relevant facts and circumstances as of the date of the consolidated financial statements. Although the Company regularly assesses these estimates, judgments and assumptions used in preparing the consolidated financial statements, actual results could differ from those estimates. Changes in estimates are recorded in the period in which they become known. The more significant estimates reflected in these consolidated financial statements include estimates of fair value of assets acquired and liabilities assumed under purchase accounting related to the Company’s acquisitions and when evaluating goodwill and long-lived assets for potential impairment, the estimated useful lives of intangible and depreciable assets, revenue recognition for multiple-element arrangements, stock-based compensation, contingent consideration, derivative instruments, certain accruals, reserves and deferred taxes. Cash Equivalents Cash and cash equivalents include all highly liquid investments with remaining maturities of three months or less at the date of purchase. Restricted Cash Restricted cash is composed of certificates of deposits and cash held by merchant banks and payment processors, which provide collateral against any chargebacks, fees, or other items that may be charged back to the Company by credit card companies and other merchants, and collateral for certain facility leases. Accounts Receivable Accounts receivable is primarily composed of cash due from credit card companies for unsettled transactions charged to subscribers’ credit cards. As these amounts reflect authenticated transactions that are fully collectible, the Company does not maintain an allowance for doubtful accounts. The Company also accrues for earned referral fees and commissions, which are governed by reseller or affiliate agreements, when the amount is reasonably estimable. Prepaid Domain Name Registry Fees Prepaid domain name registry fees represent amounts that are paid in full at the time a domain is registered by one of the Company’s registrars on behalf of a customer. The registry fees are recognized on a straight-line basis over the term of the domain registration period. Fair Value of Financial Instruments The carrying amounts of the Company’s financial instruments, which include cash equivalents, accounts receivable, accounts payable and certain accrued expenses, approximate their fair values due to their short maturities. The carrying amount of the Company’s contingent consideration is recorded at fair value. The fair value of the Company’s notes payable is based on the borrowing rates currently available to the Company for debt with similar terms and average maturities and approximates their carrying value. Derivative Instruments and Hedging Activities FASB ASC 815, Derivatives and Hedging (“ASC 815”), provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. In accordance with the FASB’s fair value measurement guidance in ASU 2011-4, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Concentrations of Credit and Other Risks Financial instruments which potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. Cash and cash equivalents are maintained at accredited financial institutions, and PayPal balances are at times without and in excess of federally insured limits. The Company has never experienced any losses related to these balances and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships. For the years ended, December 31, 2015 , 2016 and 2017 , no subscriber represented 10% or more of the Company’s total revenue. Additionally, as of December 31, 2016 and 2017 , no subscriber represented 10% or more of the Company’s total accounts receivable. Property and Equipment Property and equipment is recorded at cost or fair value if acquired in an acquisition. The Company also capitalizes the direct costs of constructing additional computer equipment for internal use, as well as upgrades to existing computer equipment which extend the useful life, capacity or operating efficiency of the equipment. Capitalized costs include the cost of materials, shipping and taxes. Materials used for repairs and maintenance of computer equipment are expensed and recorded as a cost of revenue. Materials on hand and construction-in-process are recorded as property and equipment. Assets recorded under capital lease are depreciated over the lease term. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease Software Development Costs The Company accounts for software development costs for internal use software under the provisions of ASC 350-40, “Internal-Use Software” . Accordingly, certain costs to develop internal-use computer software are capitalized, provided these costs are expected to be recoverable. During the years ended December 31, 2015 , 2016 and 2017 , the Company capitalized internal-use software development costs of $5.5 million , $11.8 million and $10.2 million , respectively. Investments The Company has minority investments in several privately-held companies. Investments in privately-held companies, in which the Company has a voting interest between 20.0% and 50.0% and exercises significant influence, are accounted for using the equity method of accounting. Under this method, the investment balance, originally recorded at cost, is adjusted to recognize the Company’s share of net earnings or losses of the investee company as they occur, limited to the extent of the Company’s investment in, advances to and commitments for the investee. The Company’s share of net earnings or losses of the investee are reflected in equity losses of unconsolidated entities, net of tax, in the Company’s accompanying consolidated statements of operations. Investments in which the Company has a voting interest of less than 20.0% and over which it does not have significant influence are accounted for under the cost method of accounting. During the year ended December 31, 2016, the Company incurred a charge of $4.7 million to impair the Company's 33.0% equity interest in Fortifico Limited, after determining that there were diminishing projected future cash flows on this investment. This charge was recorded in other income, net in the consolidated statement of operations and comprehensive loss. Refer to Note 8: Investments for further details. This impairment was recorded within the web presence segment. Business Combinations The Company accounts for business acquisitions using the purchase method of accounting, in accordance with which assets acquired and liabilities assumed are recorded at their respective fair values at the acquisition date. The fair value of the consideration paid, including contingent consideration, is assigned to the assets acquired and liabilities assumed based on their respective fair values. Goodwill represents excess of the purchase price over the estimated fair values of the assets acquired and liabilities assumed. Significant judgments are used in determining fair values of assets acquired and liabilities assumed, as well as intangibles and their estimated useful lives. Fair value and useful life determinations are based on, among other factors, estimates of future expected cash flows, royalty cost savings and appropriate discount rates used in computing present values. These judgments may materially impact the estimates used in allocating acquisition date fair values to assets acquired and liabilities assumed, as well as the Company's current and future operating results. Actual results may vary from these estimates which may result in adjustments to goodwill and acquisition date fair values of assets and liabilities during a measurement period or upon a final determination of asset and liability fair values, whichever occurs first. Adjustments to fair values of assets and liabilities made after the end of the measurement period are recorded within the Company's operating results. Changes in the fair value of a contingent consideration resulting from a change in the underlying inputs are recognized in results of operations until the arrangement is settled. Goodwill Goodwill relates to amounts that arose in connection with various acquisitions and represents the difference between the purchase price and the fair value of the identifiable intangible and tangible net assets when accounted for using the purchase method of accounting. Goodwill is not amortized, but is subject to periodic review for impairment. Events that would indicate impairment and trigger an interim impairment assessment include, but are not limited to, current economic and market conditions, a decline in the equity value of the business, a significant adverse change in certain agreements that would materially affect reported operating results, business climate or operational performance of the business and an adverse action or assessment by a regulator. In accordance with Accounting Standards Update No. 2011-08, or ASU 2011-08, Intangibles-Goodwill and Other (Topic 350) Testing Goodwill for Impairment , the Company is required to review goodwill by reporting unit for impairment at least annually or more often if there are indicators of impairment present. A reporting unit is either the equivalent of, or one level below, an operating segment. During 2016, the Company determined that it had two reporting units. The Company has historically performed its annual goodwill test as of December 31st of each fiscal year. The goodwill impairment test for the Company’s two reporting units as of December 31, 2016 followed a two-step process. In the first step, the Company compared the fair value of each reporting unit to its respective carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that reporting unit, goodwill is considered not impaired and no further testing is required. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then a second step is performed to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then an impairment loss equal to the difference is recorded. As of December 31, 2016, the fair value of both of reporting units exceeded their carrying values and, therefore, no impairment existed as of that date. As a result of changes in the Company’s management structure during fiscal year 2017, including the change in its chief executive officer / CODM, the Company has revised its internal financial reporting structure, which has resulted in a change to its reporting units. The Company has identified a total of ten reporting units under the new structure. With the increase in reporting units, the Company determined that more time would be required to perform future goodwill impairment tests, and as a result, decided to accelerate its annual goodwill impairment test date to October 31st of each fiscal year, starting with the fiscal year 2017 test. Before testing goodwill at October 31, 2017, the Company allocated assets and liabilities to their respective reporting units. Goodwill was allocated to each reporting unit in accordance with ASC 350-20-40, which requires that goodwill be allocated based on the relative fair values of each reporting unit. After completing this valuation process, the Company allocated goodwill to seven reporting units. The Company did not allocate any goodwill to three smaller reporting units that were determined to have no material fair value. The carrying value of each reporting unit is based on the assignment of the appropriate assets and liabilities to each reporting unit. Assets and liabilities were assigned to each reporting unit if the assets or liabilities are employed in the operations of the reporting unit and the asset and liability is considered in the determination of the reporting unit fair value. Certain assets and liabilities are shared by multiple reporting units, and were allocated to each reporting unit based on the relative size of a reporting unit, primarily based on revenue. The fair value of each reporting unit is determined by the income approach. The Company also compared the fair value from the income approach to a market based approach to validate that the value derived from the income approach was reasonable. For the income approach, fair value is determined based on the present value of estimated future after-tax cash flows, discounted at an appropriate risk adjusted rate. The Company uses internal forecasts to estimate future after-tax cash flows, which includes an estimate of long-term future growth rates based on the long-term outlook for each reporting unit. Actual results may differ from those assumed in each forecast. The Company derives discount rates using a capital asset pricing model and analyzing published rates for industries relevant to the reporting units to estimate the weighted average cost of capital. The Company uses discount rates that are commensurate with the risks and uncertainty inherent in the business and in internally developed forecasts. For fiscal year 2017, the Company used a discount rate of 10.0% , and also performed sensitivity analysis on the discount rates. For the market approach validation, values were derived based on valuation multiples from sales of comparable companies. The Company has also early adopted the provisions of ASU 2017-4, which eliminates the second step of the goodwill impairment test. As a result, the goodwill impairment test as of October 31, 2017 includes only one step, which is a comparison of the carrying value of each reporting unit to its fair value, and any excess carrying value, up to the amount of goodwill allocated to that reporting unit, is impaired. The goodwill impairment test as of October 31, 2017 resulted in a $12.1 impairment of goodwill to the Company's domain monetization reporting unit within the domain segment. The impairment is a direct result of a more rapid decline in domain parking revenue than originally expected, and to a lesser extent, reduced sales of premium domain names. Goodwill for this reporting unit has been completely impaired. Goodwill allocated to the other six reporting units was not impaired. Goodwill as of December 31, 2017 is $1,850.6 million . Approximately $1,820.7 million of this goodwill relates to reporting units where fair value exceeds each reporting units carrying value by at least 20% . One reporting unit, the domain.com reporting unit within the domain segment, has a goodwill balance of $29.9 million , and a fair value fair value that exceeds its carrying value by 6% . The Company has one reporting unit, the backup reporting unit that is within the web presence segment, that has a negative carrying value and has been allocated $2.3 million of goodwill. Long-Lived Assets The Company’s long-lived assets consist primarily of intangible assets, including acquired subscriber relationships, trade names, intellectual property, developed technology, domain names available for sale and in-process research and development (“IPR&D”). The Company also has long-lived tangible assets, primarily consisting of property and equipment. The majority of the Company’s intangible assets are recorded in connection with its various acquisitions. The Company’s intangible assets are recorded at fair value at the time of their acquisition. The Company amortizes intangible assets over their estimated useful lives. Determination of the estimated useful lives of the individual categories of intangible assets is based on the nature of the applicable intangible asset and the expected future cash flows to be derived from the intangible asset. Amortization of intangible assets with finite lives is recognized in accordance with their estimated projected cash flows. The Company evaluates long-lived intangible and tangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If indicators of impairment are present and undiscounted future cash flows are less than the carrying amount, the fair value of the assets is determined and compared to the carrying value. If the fair value is less than the carrying value, then the carrying value of the asset is reduced to the estimated fair value and an impairment loss is charged to expense in the period the impairment is identified. During the year ended December 31, 2016, the Company determined that a portion of an internally developed software tool would not meet its needs following the acquisition of Constant Contact, resulting in an impairment charge of $2.0 million which was recorded in engineering and development expense in the consolidated statements of operations and comprehensive loss. Additionally, the Company recognized an impairment charge of $0.5 million relating to internally developed software relating to Webzai Ltd. (“Webzai”), and another impairment charge of $4.4 million relating to developed technology acquired in the Webzai acquisition, for a total impairment charge of $4.9 million , which was recorded in engineering and development expense in the consolidated statements of operations and comprehensive loss. Refer to Note 6: Property and Equipment and Capital Lease Obligations and Note 7: Goodwill and Other Intangible Assets for further details. Also during the year ended December 31, 2016, the Company incurred total impairment charges of IPR&D of $2.2 million , consisting of $1.4 million to impair certain acquired IPR&D projects from the Webzai acquisition that were abandoned during the year ended December 31, 2016 and a charge of $0.8 million to impair certain acquired IPR&D projects from the AppMachine acquisition. Refer to Note 7: Goodwill and Other Intangible Assets , and Acquired In- Process Research and Development (IPR&D) below for further details. All of the 2016 impairments described above were recognized in the web presence segment. During the year ended December 31, 2017, the Company recognized an impairment charge of $13.8 million relating to certain domain name intangible assets acquired in 2014, which was recorded in cost of revenue in the consolidated statements of operations and comprehensive loss. The impairment resulted from diminished cash flows associated with these intangible assets. Also during the year ended December 31, 2017, the Company recognized an impairment charge of $4.9 million primarily relating to developed technology and customer relationships associated with the acquisition the Directi web presence business in 2014. This impairment was recorded in cost of revenue in the consolidated statements of operations and comprehensive loss. The impairment resulted from diminished cash flows associated with these intangible assets. All of the 2017 impairments described above were recognized in the domains segment. Indefinite life intangible assets include domain names that are available for sale which are recorded at cost to acquire. These assets are not being amortized and are being tested for impairment annually and whenever events or changes in circumstance indicate that their carrying value may not be recoverable. When a domain name is sold, the Company records the cost of the domain in cost of revenue. Acquired In-Process Research and Development (IPR&D) Acquired IPR&D represents the fair value assigned to research and development assets that the Company acquires that have not been completed at the date of acquisition. The acquired IPR&D is capitalized as an intangible asset and reviewed on a quarterly basis to determine future use. Any impairment loss of the acquired IPR&D is charged to expense in the period the impairment is identified. Upon commercialization, the acquired fair value of the IPR&D will be reclassified to developed technology and amortized over its estimated useful life. No such impairment losses were identified for the year ended December 31, 2015 . During the year ended December 31, 2016, the Company identified that the acquired fair value of the remaining IPR&D acquired in connection with its acquisition of Webzai was impaired as these IPR&D projects were abandoned in favor of other projects. At that time, and as mentioned above, the Company recorded a $1.4 million impairment charge, which is reflected in engineering and development expense during the year ended December 31, 2016 in the Company’s consolidated statements of operations and comprehensive loss. Additionally, during the year-ended December 31, 2016, the Company identified that the acquired fair value of the remaining IPR&D acquired in connection with its acquisition of AppMachine B.V. was impaired as these projects were abandoned in favor of other projects, and as such, the Company recorded a $0.8 million impairment charge, which is also reflected in engineering and development expense during the year ended December 31, 2016 in the Company’s consolidated statements of operations and comprehensive loss. During 2014, the Company capitalized $4.6 million of IPR&D in connection with its acquisition of Webzai. During the year ended December 31, 2015, $3.2 million was reclassified to developed technology and wa being amortized over the estimated useful life of 4.0 years . During 2015, the Company did not capitalize any IPR&D in connection with its acquisitions of the assets of the U.S. retail portion of the Verio business of NTT America, Inc. (“Verio”), the assets of World Wide Web Hosting, LLC (“WWWH”), the assets of Ace Data Centers, Inc. (“Ace DC”) and the ownership interests in Ace Holdings, LLC (“Ace Holdings”) (these acquired assets and ownership interests, collectively, “Ace”) and the assets of Ecommerce, LLC, (“Ecommerce”). During 2016, in addition to the impairment of the Webzai IPR&D mentioned above, the Company also capitalized $1.7 million of IPR&D in connection with its acquisition of AppMachine B.V. ("AppMachine"), of which approximately $0.9 million was reclassified to developed technology and is being amortized over the estimated useful life of 4.0 years, and the remaining $0.8 million was impaired, as previously mentioned. The Company did not capitalize any other IPR&D in connection with its other 2016 acquisitions of WZ UK and Constant Contact. Revenue Recognition The Company generates revenue primarily from selling subscriptions for cloud-based products and services. The subscriptions are similar across all of the Company’s brands and are provided under contracts pursuant to which the Company has ongoing obligations to support the subscriber. These contracts are generally for service periods of up to 36 months and typically require payment in advance. The Company recognizes the associated revenue ratably over the service period , whether the associated revenue is derived from a direct subscriber or through a reseller. Deferred revenue represents the liability to subscribers for advance billings for services not yet provided and the fair value of the assumed liability outstanding for subscriber relationships purchased in an acquisition. The Company sells domain name registrations that provide a subscriber with the exclusive use of a domain name. These domains are primarily obtained by one of the Company’s registrars on the subscriber’s behalf, or to a lesser extent by the Company from third-party registrars on the subscriber’s behalf. Domain registration fees are non-refundable. Revenue from the sale of a domain name registration by a registrar within the Company is recognized ratably over the subscriber’s service period as the Company has the obligation to provide support over the domain term. Revenue from the sale of a domain name registration purchased by the Company from a third-party registrar is recognized when the subscriber is billed on a gross basis as there are no remaining Company obligations once the sale to the subscriber occurs, and the Company has full discretion on the sales price and bears all credit risk. Revenue from the sale of premium domains is recognized when persuasive evidence of an arrangement to sell such domains exists, delivery of an authorization key to access the domain name has occurred, the fee for the sale of the premium domain is fixed or determinable, and collection of the fee for the sale of the premium domain is deemed probable. Revenue from the sale of non-term based applications and services, such as certain online security products and professional technical services, referral fees and commissions, is recognized when the product is purchased, the service is provided or the referral fee or commission is earned, respectively. A substantial amount of the Company’s revenue is generated from transactions that are multiple-element service arrangements that may include hosting plans, domain name registrations, and other cloud-based products and services. The Company follows the provisions of the FASB, Accounting Standards Update (“ASU”) No. 2009-13 (“ASU 2009-13”), Revenue Recognition (Topic 605), Multiple-Deliverable Revenue Arrangements—a consensus of the FASB Emerging Issues Task Force and allocates revenue to each deliverable in a multiple-element service arrangement based on its respective relative selling price. Under ASU 2009-13, to treat deliverables in a multiple-element service arrangement as separate units of accounting, the deliverables must have standalone value upon delivery. If the deliverables have standalone value upon delivery, the Company accounts for each deliverable separately. Hosting services, domain name registrations, cloud-based products and services have standalone value and are often sold separately. When multiple deliverables included in a multiple-element service arrangement are separated into different units of accounting, the total transaction amount is allocated to the identified separate units based on a relative selling price hierarchy. The Company determines the relative selling price for a deliverable based on vendor specific objective evidence (“VSOE”) of fair value, if available, or best estimate of selling price (“BESP”), if VSOE is not available. The Company has determined that third-party evidence of selling price (“TPE”) is not a practical alternative due to differences in its multi-brand offerings compared to competitors and the lack of availability of relevant third-party pricing information. The Company has not established VSOE for its offerings due to lack of pricing consistency, the introduction of new products, services and other factors. Accordingly, the Company generally allocates revenue to the deliverables in the arrangement based on the BESP. The Company determines BESP by considering its relative selling prices, competitive prices in the marketplace and management judgment; these selling prices, however, may vary depending upon the particular facts and circumstances related to each deliverable. The

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions The Company accounts for the acquisitions of businesses using the purchase method of accounting. The Company allocates the purchase price to the tangible and identifiable intangible assets and liabilities assumed based on their estimated fair values. Purchased identifiable intangible assets typically include subscriber relationships, trade names, domain names held for sale, developed technology and IPR&D. The methodologies used to determine the fair value assigned to subscriber relationships and domain names held for sale are typically based on the excess earnings method that considers the return received from the intangible asset and includes certain expenses and also considers an attrition rate based on the Company’s internal subscriber analysis and an estimate of the average life of the subscribers. The fair value assigned to trade names is typically based on the income approach using a relief from royalty methodology that assumes that the fair value of a trade name can be measured by estimating the cost of licensing and paying a royalty fee for the trade name that the owner of the trade name avoids. The fair value assigned to developed technology typically uses the relief from royalty method. The fair value assigned to IPR&D is based on the relief from royalty method. If applicable, the Company estimates the fair value of contingent consideration payments in determining the purchase price. The contingent consideration is then adjusted to fair value in subsequent periods as an increase or decrease in current earnings in general and administrative expense in the consolidated statements of operations and comprehensive loss. Acquisitions—2015 Verio On May 26, 2015, the Company acquired the assets of the U.S. retail portion of the Verio business of NTT America, Inc., a provider of shared, virtual private server (“VPS”) and dedicated hosting services. The aggregate purchase price was $13.0 million , of which $10.5 million was paid in cash at the closing. The Company was obligated to pay the remaining cash consideration of $2.5 million on the first anniversary of the acquisition, less amounts used to satisfy any obligation determined to be owed to the Company for any indemnity pursuant to the asset purchase agreement. As of December 31, 2017, the Company has paid all of the remaining $2.5 million cash consideration. The purchase price of $13.0 million has been allocated to intangible assets consisting of subscriber relationships and trade names of $13.1 million and $0.1 million , respectively, and goodwill of $1.2 million , offset by deferred revenue of $1.4 million . Goodwill related to the acquisition is deductible for tax purposes and related primarily to expected synergies. Goodwill relating to this acquisition is included within the web presence segment. World Wide Web Hosting On June 25, 2015, the Company acquired substantially all of the assets of World Wide Web Hosting ("WWWH"), a provider of web presence solutions doing business under the brand name Site5. The Company previously had an equity interest in WWWH, which was originally acquired when the Company acquired Hostgator.com LLC on July 13, 2012. The aggregate purchase price was $34.9 million , $23.0 million of which was payable in cash and $11.9 million of which was the implied value of the pro rata interest in the acquired assets that the Company obtained upon the seller’s redemption of its 40% equity interest in WWWH. The Company recognized a $5.4 million gain as a result of this redemption, which was recorded as other income in the Company’s consolidated statement of operations and comprehensive loss. Of the $23.0 million payable in cash, $18.4 million was paid at the closing and the Company was obligated to pay the remaining cash consideration of $4.6 million on the first anniversary of the acquisition, less amounts used to satisfy any obligation determined to be owed to the Company for any indemnity pursuant to the asset purchase agreement. The Company paid the remaining cash consideration of $4.6 million during the year ended December 31, 2016. The purchase price of $34.9 million has been allocated to intangible assets consisting of subscriber relationships and trade names of $11.0 million and $1.9 million , respectively, goodwill of $23.3 million , and prepaid expenses and other current assets of $1.2 million , offset by deferred revenue of $2.5 million . Goodwill related to the acquisition is deductible for tax purposes and related primarily to expected synergies. Goodwill relating to this acquisition is included within the web presence segment. Ace Data Center and Ace Holdings On September 21, 2015, the Company entered into a purchase agreement with Ace Data Center ("Ace DC") to acquire substantially all of the assets of Ace DC and with Ace Holdings and its owners to acquire all of the ownership interests in Ace Holdings. Ace DC is the former manager of a data center that provides colocation, infrastructure and carrier-neutral connectivity services. This data center is the Company’s largest data center. Ace Holdings owned the real property, improvements and building at and on which the data center is located, including certain non-systems equipment and personal property. The aggregate purchase price was $74.0 million , of which $44.4 million was paid in cash at the closing. Under the terms of the purchase agreement, within approximately 75 days of the closing date of the acquisition, the purchase consideration was subject to a working capital adjustment and a tax gross up adjustment, which resulted in an additional $0.7 million payment from the Company on December 2, 2015. The Company was obligated to pay the remaining cash consideration of $31.5 million on the first anniversary of the acquisition, less amounts used to satisfy any obligation determined to be owed to the Company for any indemnity pursuant to the asset purchase agreement. The net present value of the remaining cash consideration was $28.9 million , which was the amount used to calculate the $74.0 million aggregate purchase price above. An aggregate amount of $0.7 million for the accretion of the present value of the remaining cash consideration was included in interest expense for the year ended December 31, 2015, resulting in the net present value of the remaining cash consideration at December 31, 2015 of $29.6 million . The Company paid the remaining cash consideration of $31.4 million during the year ended December 31, 2016. The purchase price of $74.0 million has been allocated to property and equipment, including real property, of $12.1 million , goodwill of $62.2 million , prepaid expenses and other current assets of $0.2 million and developed technology of $0.1 million , offset by other liabilities of $0.6 million . The goodwill reflects the value of estimated cost efficiencies gained for the Company by owning its own data center. Goodwill related to the acquisition is deductible for tax purposes. Goodwill relating to this acquisition is included within the web presence segment. Ecommerce On November 2, 2015, the Company acquired substantially all of the assets of Ecommerce, a provider of shared, VPS and cloud hosting services, domain registration services and add-on products. The aggregate purchase price was $28.0 million , of which $23.8 million was paid in cash at the closing. The Company was obligated to pay the remaining cash consideration of $4.2 million on the first anniversary of the acquisition, less amounts used to satisfy any obligation determined to be owed to the Company for any indemnity pursuant to the asset purchase agreement. The Company paid the remaining cash consideration during the year ended December 31, 2016. The purchase price of $28.0 million has been allocated to intangible assets consisting of subscriber relationships, intellectual property and trade names of $9.4 million , $4.4 million and $0.1 million , respectively, and goodwill of $16.7 million , offset by deferred revenue of $2.6 million . Goodwill reflects the value of estimated synergies and is deductible for tax purposes. Goodwill relating to this acquisition is included within the web presence segment. Acquisitions—2016 WZ (UK) Ltd. In August 2014, the Company made an aggregate investment of $3.9 million for a joint venture with a 49% ownership interest in WZ (UK) Ltd. ("WZ UK"), which is a provider of technology and sales and marketing services associated with web builder solutions. The Company and the other shareholders of WZ UK entered into a put and call option for the Company to acquire additional equity interests of WZ UK under certain circumstances. On January 6, 2016, the Company partially exercised this option, which increased its stake in WZ UK from 49% to 57.5% . Upon the exercise of the option, the Company estimated the fair value of the assets and liabilities in accordance with the guidance for business combinations and estimated that the value of the noncontrolling interest (“NCI”) on January 6, 2016 was $10.8 million . The estimated aggregate purchase price of $22.2 million included a gain of $11.4 million that was calculated based on the implied fair value of the Company’s 49.0% equity investment and the NCI of $10.8 million , which were allocated to goodwill of $21.6 million , intangible assets consisting of subscriber relationships of $4.9 million , and property, plant and equipment of $0.3 million , offset by deferred revenue of $3.3 million and negative working capital of $1.3 million . Goodwill related to the acquisition, which is part of the Company’s web presence reporting segment, is not deductible for tax purposes. Goodwill reflected primarily marketing know-how of the acquired company. Goodwill relating to this acquisition is included within the web presence segment. The Company recognized the $11.4 million gain in other income in the Company’s consolidated statements of operations and comprehensive loss. As the NCI is subject to a put option that is outside the control of the Company, it is deemed a redeemable non-controlling interest and not recorded in permanent equity, and is being presented as mezzanine redeemable non-controlling interest on the consolidated balance sheet. The difference between the initial fair value of the redeemable non-controlling interest and the value expected to be paid on exercise, which is estimated to be $30.0 million , was being accreted over the period commencing January 6, 2016, and up to the end of the second call option period which was August 14, 2016. Adjustments to the carrying amount of the redeemable non-controlling interest were charged to additional paid-in capital. On May 16, 2016, the Company amended the put and call option described above to allow it to acquire an additional equity interest in WZ UK earlier than August 2016. Pursuant to this amended option, on the same date the Company acquired an additional 20% stake in WZ UK for $15.4 million , thus increasing its ownership interest from 57.5% to 77.5% . On July 13, 2016, WZ UK completed a restructuring pursuant to which the Company and the minority shareholders of Pseudio Limited and Resume Labs Limited sold their shares in these entities to WZ UK, in exchange for shares in WZ UK. As a result of the restructuring, Pseudio Limited and Resume Labs Limited became wholly-owned subsidiaries of WZ UK, and the Company’s ownership of WZ UK was diluted from 77.5% to 76.4% . Immediately subsequent to the restructuring, the Company acquired an additional 10% equity interest in WZ UK for $18.0 million , thereby increasing the Company’s ownership interest to 86.4% . Concurrent with the restructuring, the Company amended the put and call option described above to provide for the Company to acquire the remaining 13.6% equity interest in WZ UK for $25.0 million under certain circumstances, either through a put option that was exercisable by the minority shareholders of WZ UK beginning on July 1, 2017, or by a call option that was exercisable by the Company beginning on January 1, 2018. The Company started accreting the $25.0 million starting in July 2016 through the earliest redemption date of July 1, 2017. On July 7, 2017, the Company redeemed the remaining redeemable non-controlling interest for $25.0 million . Refer to Note 13: Redeemable Non-Controlling Interest, for further details. Constant Contact, Inc. On October 30, 2015, the Company entered into a definitive agreement pursuant to which it agreed to acquire all of the outstanding shares of common stock of Constant Contact for $32.00 per share in cash, for a total purchase price of approximately $1.1 billion . The acquisition closed on February 9, 2016. The aggregate purchase price of $1.1 billion , which was paid in cash at the closing, is being allocated to intangible assets consisting of subscriber relationships, developed technology and trade names of $263.0 million , $83.0 million and $52.0 million , respectively, goodwill of $604.3 million , property and equipment of $39.6 million , and working capital of $184.2 million , offset by a net deferred tax liability of $125.1 million and deferred revenue of $25.2 million . The goodwill reflects the value of expected synergies. Goodwill related to the acquisition, which is included in the Company’s email marketing reporting unit, is not deductible for tax purposes. Goodwill relating to this acquisition is included within the email marketing segment. AppMachine B.V. In December 2014, the Company made an aggregate investment of $15.2 million to acquire a 40.0% ownership interest in AppMachine B.V. (“AppMachine”), a developer of software that allows users to build mobile applications for smart devices such as phones and tablets. Under the terms of the investment agreement for AppMachine, the Company was obligated to purchase the remaining 60.0% of AppMachine in three tranches of 20.0% within specified periods if AppMachine achieved a specified minimum revenue threshold within a designated timeframe. The consideration for each of those three tranches was to be calculated as the product of AppMachine’s revenue, as defined in that investment agreement, for the trailing twelve-month period prior to the applicable determination date times a specified multiple based upon year over year revenue growth multiplied by 20.0% . On July 27, 2016, the Company acquired the remaining 60% equity interest in AppMachine, increasing the Company’s stake to 100% . In connection with the acquisition, the parties terminated the prior investment agreement pursuant to which the Company was obligated to purchase the remaining shares in AppMachine in three tranches. The total consideration based on the new agreement was $22.5 million , of which $5.5 million was paid upon closing, and the remaining $17.0 million (which includes $4.0 million of post-acquisition compensation expense) is payable in annual installments over a period of four years , commencing with June 21, 2017. The net present value of the additional consideration is $11.5 million , which was included in the aggregate purchase price and recorded as deferred consideration in the Company’s consolidated balance sheet as of December 31, 2017. The remaining $1.5 million is being accreted as interest expense. The $4.0 million relating to retention bonuses is being accrued over the employment term associated with these employees. On the date of acquisition, the Company recognized a loss of $4.9 million that was calculated based on the implied fair value of the investment, which was recorded in other income (expense) in the Company’s consolidated statements of operations and comprehensive loss. The purchase price of $25.7 million , which consists of the purchase consideration of $13.0 million (at a present value of $11.5 million ) and the carrying value of the existing investment of $13.6 million , partially offset by the loss of $4.9 million , is being allocated on a preliminary basis to intangible assets consisting of the following: subscriber relationships of $0.1 million ; developed technology of $1.7 million ; technology in the process of development of $1.7 million ; goodwill of $21.5 million , property and equipment of $0.6 million ; and working capital of approximately $0.4 million , offset by deferred revenue of $0.2 million and other long term liabilities of $0.1 million . Goodwill related to the acquisition, which is included in the Company’s web presence reporting unit, is not deductible for tax purposes. The goodwill reflects the value of expected synergies and technology know-how. Goodwill relating to this acquisition is included within the web presence segment. Summary of Deferred Consideration Related to Acquisitions Components of deferred consideration short-term and long-term as of December 31, 2016, consisted of the following: Short- term Long- term (in thousands) Mojoness, Inc. (Acquired in 2012) $ 818 $ — Verio (Acquired in 2015) 50 — Social Booster (Acquired in 2016) 40 25 AppMachine (Acquired in 2016) 4,365 7,419 Total $ 5,273 $ 7,444 Components of deferred consideration short-term and long-term as of December 31, 2017, consisted of the following: Short- term Long- term (in thousands) AppMachine (Acquired in 2016) 4,365 3,551 Total $ 4,365 $ 3,551

Derivatives and Hedging Activit

Derivatives and Hedging Activities	12 Months Ended
	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	Derivatives and Hedging Activities Risk Management Objective of Using Derivatives The Company is exposed to certain risk arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its debt funding and the use of derivative financial instruments. Specifically, the Company may enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings. Cash Flow Hedges of Interest Rate Risk The Company entered into a three -year interest rate cap on December 9, 2015 as part of its risk management strategy. The objective of this interest rate cap, designated as cash flow hedges, involves the receipt of variable amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an upfront premium. Therefore, this derivative limits the Company’s exposure if the rate rises, but also allows the Company to benefit when the rate falls. The effective portion of changes in the fair value of derivatives that qualify as cash flow hedges is recorded in Accumulated Other Comprehensive Income (“AOCI”), and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. Any ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. There was no ineffectiveness recorded in earnings for the year ended December 31, 2017 . As of December 31, 2017 , the Company had one interest rate cap with $500.0 million notional outstanding that was designated as a cash flow hedge of interest rate risk. The fair value of the interest rate contracts on the consolidated balance sheet as of December 31, 2016 and 2017 was $1.0 million and $0.5 million , respectively. During the year ended December 31, 2016 , the Company recognized an immaterial amount of interest expense in the Company's consolidated statement of operations. During the year ended December 31, 2017, the Company recognized $0.6 million of interest expense in the Company's consolidated statement of operations. The Company recognized a $ $0.0 million loss, net of tax benefit of $0.0 million in AOCI for the year ended December 31, 2017 . The Company estimates that $1.9 million of the losses recognized in AOCI will be reclassified as an increase to interest expense in the next twelve months. For the year ended December 31, 2016 , the Company recognized a $1.4 million gain in AOCI, net of a tax benefit of $0.8 million .

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following valuation hierarchy is used for disclosure of the inputs to valuation used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows: • Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. • Level 2 inputs are quoted prices for similar assets or liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. • Level 3 inputs are unobservable inputs based on the Company’s own assumptions used to measure assets and liabilities at fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. As of December 31, 2016 and 2017 , the Company’s financial assets or liabilities required to be measured on a recurring basis are accrued earn-out consideration payable in connection with the 2012 acquisition of certain assets of Mojoness, Inc., or Mojo, and the 2015 interest rate cap discussed in Note 5 below. The Company has classified its interest rate cap within Level 2 of the fair value hierarchy. The Company has classified its liabilities for contingent earn-out consideration related to the Mojo acquisition within Level 3 of the fair value hierarchy because the fair value is determined using significant unobservable inputs, which included probability weighted cash flows. During the year ended December 31, 2017, the Company paid $ 0.8 million related to the earn-out provisions for the Mojo acquisition, which constituted the final payment for this acquisition. Basis of Fair Value Measurements Balance Quoted Prices in Active Markets for Identical Items (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Balance at December 31, 2016 Financial assets: Interest rate cap (included in other assets) $ 979 — $ 979 $ — Total financial assets $ 979 $ — $ 979 $ — Financial liabilities: Contingent earn-out consideration $ 818 — — $ 818 Total financial liabilities $ 818 $ — $ — $ 818 Balance at December 31, 2017 Financial assets: Interest rate cap (included in other assets) $ 452 — $ 452 $ — Total financial assets $ 452 $ — $ 452 $ — The following table summarizes the changes in the financial liabilities measured on a recurring basis using Level 3 inputs as of December 31, 2016 and 2017 : Amount (in thousands) Financial liabilities measured using Level 3 inputs at December 31, 2015 $ 1,469 Payment of contingent earn-outs related to 2012 acquisitions (668 ) Change in fair value of contingent earn-outs 17 Financial liabilities measured using Level 3 inputs at December 31, 2016 818 Payment of contingent earn-outs related to 2012 acquisitions (818 ) Change in fair value of contingent earn-outs — Financial liabilities measured using Level 3 inputs at December 31, 2017 $ —

Property and Equipment and Capi

Property and Equipment and Capital Lease Obligations	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment and Capital Lease Obligations	Property and Equipment and Capital Lease Obligations Components of property and equipment consisted of the following: As of December 31, 2016 2017 (in thousands) Land $ 790 $ 790 Building 5,517 5,037 Software 52,130 82,618 Computers and office equipment 143,091 153,273 Furniture and fixtures 10,892 18,825 Leasehold improvements 21,244 22,260 Construction in process 6,691 3,800 Property and equipment—at cost 240,355 286,603 Less accumulated depreciation (145,083 ) (191,151 ) Property and equipment—net $ 95,272 $ 95,452 Depreciation expense related to property and equipment for the years ended December 31, 2015 , 2016 and 2017 was $34.0 million , $60.4 million , and $55.2 million , respectively. The Company evaluates long-lived assets such as property, plant and equipment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If indicators of impairment are present and undiscounted future cash flows are less than the carrying amount, the fair value of the assets is determined and compared to the carrying value. If the fair value is less than the carrying value, then the carrying value of the asset is reduced to the estimated fair value and an impairment loss is charged to expense in the period the impairment is identified. During the year ended December 31, 2016 , the Company determined that a portion of an internally developed software tool would not meet its needs following the acquisition of Constant Contact. As a result, the Company recorded a $2.0 million impairment charge in engineering and development expense in the Company’s consolidated statements of operations and comprehensive loss. Additionally, during the year ended December 31, 2016, the Company recorded an impairment charge of $0.5 million in engineering and development expense relating to internally developed software, developed after the Webzai acquisition, which closed in August 2014, after evaluating it for impairment in accordance with ASC 360, Property, Plant and Equipment. This software is also linked to certain developed technology that was acquired as part of the Webzai acquisition and was also determined to be impaired. Refer to Note 7: Goodwill and Other Intangible Assets for further details. Both of these impairment charges discussed above were recognized in the Company's web presence segment. During the year ended December 31, 2017 , the Company did not recognize any impairments with respect to its property, plant and equipment. During the years ended December 31, 2016 and 2017 , the Company entered into agreements to lease software licenses for use on certain data center server equipment for terms ranging from twenty-four months to thirty-nine months . As of December 31, 2016 and 2017 , the Company’s software shown in the above table included the software assets under a capital lease as follows: As of December 31, 2016 2017 (in thousands) Software $ 21,499 $ 17,256 Less accumulated depreciation (14,750 ) (2,265 ) Assets under capital lease—net $ 6,749 $ 14,991 At December 31, 2017 , the expected future minimum lease payments under the capital lease discussed above were approximately as follows: Amount (in thousands) 2018 8,384 2019 7,977 Total minimum lease payments $ 16,361 Less amount representing interest (1,012 ) Present value of minimum lease payments (capital lease obligation) $ 15,349 Current portion $ 7,630 Long-term portion $ 7,719

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets The following table summarizes the changes in the Company’s goodwill balances as of December 31, 2016 and 2017 : Web presence Email marketing Domain Total Amount (in thousands) Goodwill balance at December 31, 2015 $ 1,207,255 $ — $ — $ 1,207,255 Goodwill related to 2015 acquisitions 5,978 — — 5,978 Goodwill related to 2016 acquisitions 43,019 604,305 — 647,324 Foreign translation impact (648 ) — — (648 ) Goodwill balance at December 31, 2016 1,255,604 604,305 — 1,859,909 Reallocation of goodwill (41,987 ) — 41,987 — Foreign translation impact 2,802 — 2,802 Impairment — — (12,129 ) (12,129 ) Goodwill balance at December 31, 2017 $ 1,216,419 $ 604,305 $ 29,858 $ 1,850,582 In accordance with ASC 350, the Company reviews goodwill and other indefinite-lived intangible assets for indicators of impairment on an annual basis and between tests if an event occurs or circumstances change that would more likely than not reduce the fair value of goodwill below its carrying amount. As of December 31, 2016 , the fair value of each of the Company’s reporting units exceeded the carrying value of the reporting unit’s net assets and, therefore, no impairment existed as of that date. During the quarter and year ended December 31, 2017, an impairment charge of $12.1 million was recorded in the consolidated statement of operations and comprehensive loss relating to the Company's domain segment. Refer to Note 2: Summary of Significant Accounting Policies above for further details. At December 31, 2016 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 284,005 $ 111,348 $ 172,657 7 years Subscriber relationships 659,662 345,070 314,592 7 years Trade-names 133,805 57,789 76,016 8 years Intellectual property 34,084 10,270 23,814 13 years Domain names available for sale 29,954 4,976 24,978 Indefinite Leasehold interests 314 314 — 1 year Total December 31, 2016 $ 1,141,824 $ 529,767 $ 612,057 At December 31, 2017 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 285,911 $ 149,514 $ 136,397 7 years Subscriber relationships 659,732 431,938 227,794 7 years Trade-names 134,054 73,019 61,035 8 years Intellectual property 34,313 27,336 6,977 5 years Domain names available for sale 30,458 7,221 23,237 Indefinite Leasehold interests 314 314 — 1 year Total December 31, 2017 $ 1,144,782 $ 689,342 $ 455,440 During the year ended December 31, 2016, the Company wrote off acquired in-process research and development of $1.4 million related to its acquisition of Webzai and $0.8 million related to its acquisition of AppMachine, as the Company had abandoned certain research and development projects in favor of other projects. Additionally, during the year ended December 31, 2016, the Company recorded an impairment charge of $4.4 million relating to developed technology from the Webzai acquisition, after evaluating it for impairment in accordance with ASC 350. These impairment charges were recognized in engineering and development expense in the Company's web presence segment. The Company used the relief from royalty method in estimating the fair value of the developed technology. During the year ended December 31, 2017 , the Company wrote down intellectual property, specifically, certain domain names that generated domain monetization revenue, to fair value and recorded a charge of $18.7 million , which is included in cost of revenue in the consolidated statement of operations and comprehensive loss. The impairment resulted from diminishing cash flows associated with these assets. This impairment charge was recognized in the Company's domain segment. The estimated useful lives of the individual categories of other intangible assets are based on the nature of the applicable intangible asset and the expected future cash flows to be derived from the intangible asset. Amortization of intangible assets with finite lives is recognized over the period of time the assets are expected to contribute to future cash flows. The Company amortizes finite-lived intangible assets over the period in which the economic benefits are expected to be realized based upon their estimated projected cash flows. The Company’s amortization expense is included in cost of revenue in the aggregate amounts of $91.1 million , $143.6 million , and $140.4 million for the years ended December 31, 2015 , 2016 and 2017 , respectively. At December 31, 2017 , the expected future amortization of the other intangible assets, excluding indefinite life and in-process research and development intangibles, was approximately as follows: Year Ending December 31, Amount (in thousands) 2018 $ 100,637 2019 82,705 2020 69,792 2021 60,676 2022 36,232 Thereafter 82,161 Total $ 432,203

Investments

Investments	12 Months Ended
	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments As of December 31, 2016 and 2017 , the Company’s carrying value of investments in privately-held companies was $15.9 million and $15.3 million , respectively. In January 2012, the Company made an initial investment of $0.3 million to acquire a 25% interest in BlueZone Labs, LLC (“BlueZone”), a provider of “do-it-yourself” tools and managed search engine optimization services. The Company also has an agreement with BlueZone to purchase products and services. During the years ended December 31, 2016 and 2017 , the Company purchased $1.6 million and $1.7 million , respectively, of products and services from BlueZone, which is included in the Company’s consolidated statements of operations and comprehensive loss. As of December 31, 2016 and 2017 , $0.1 million and $0.1 million , respectively, relating to the investment in BlueZone was included in accounts payable and accrued expense in the Company’s consolidated balance sheet. As of December 31, 2016 and 2017, $0.0 million and $0.7 million , respectively, relating to the investment in BlueZone was included in prepaid expenses in the Company's consolidated balance sheet. In July 2012, the Company assumed a 50% interest in WWWH, a provider of web presence solutions, with a fair value of $10.0 million . On October 31, 2013, the Company sold 20% of its ownership interest, or 10% of the capital stock of WWWH, reducing its equity interest to 40% . On June 25, 2015, the Company acquired substantially all of the assets of WWWH. In connection with the asset purchase agreement dated June 25, 2015, the seller redeemed from the Company its 40% equity interest in exchange for a pro rata interest in the acquired assets, which had an estimated implied value of $11.9 million . The Company recognized a $5.4 million gain as a result of the redemption of its equity interest, which was recorded as other income for the year ended December 31, 2015 in the Company’s consolidated statements of operations and comprehensive loss. In addition, the Company received a $3.5 million repayment of total notes receivable that were due to the Company from the seller of WWWH prior to the acquisition. For more detail, see Note 3: Acquisitions to the consolidated financial statements. In May 2014, the Company made a strategic investment of $15.0 million in Automattic, Inc. (“Automattic”), which provides content management systems associated with WordPress. The investment represents less than 5.0% of the outstanding shares of Automattic and better aligns the Company with an important partner. In August 2014, the Company made an aggregate investment of $3.9 million for a joint venture with a 49.0% ownership interest in WZ UK Ltd., which is a provider of technology and sales marketing services associated with web builder solutions. On January 6, 2016, the Company exercised an option to increase its stake in WZ UK Ltd from 49.0% to 57.5% . Refer to Note 3: Acquisitions for further details. During the year ended December 31, 2015, the Company’s proportionate share of net loss from its investment in WZ UK Ltd. was $13.9 million . On July 2, 2015, the Company and the majority investor made additional equity contributions to WZ UK Ltd. The Company’s share of the incremental investments was approximately $7.4 million . On December 21, 2015, the Company and the majority investor made additional equity contributions to WZ UK Ltd. The Company’s share of the incremental investment was $1.1 million . On January 6, 2016, the Company exercised its option to increase its stake on WZ UK Ltd. from 49.0% to 57.5% , thereby acquiring a controlling interest. As of December 31, 2016, WZ UK Ltd. is consolidated in the Company's financial statements. Refer to Note 3: Acquisitions and Note 13: Redeemable Non-controlling Interest, for further details. In December 2014, the Company also made an aggregate investment of $15.2 million to acquire a 40.0% ownership interest in AppMachine, which is a developer of software that allows users to build mobile applications for smart devices such as phones and tablets. Under the terms of the investment agreement for AppMachine, the Company was obligated to purchase the remaining 60.0% of AppMachine in three tranches of 20.0% within specified periods if AppMachine achieved a specified minimum revenue threshold within a designated timeframe. The agreement was terminated in July 2016, when the Company acquired the remaining 60.0% of the equity interest in AppMachine. Refer to Note 3: Acquisitions for further details. On March 3, 2016, the Company purchased a $0.6 million convertible promissory note from a business that provides web and mobile money management solutions, with the potential for subsequent purchases of additional convertible notes. During the year ended December 31, 2017 , the Company recognized an impairment expense of $0.6 million in other expense in the consolidated statement of operations and comprehensive loss, as the carrying amount of the investment was deemed unrecoverable. This impairment was recognized in the Company's web presence segment. On April 8, 2016, the Company made an investment of $5.0 million for a 33.0% equity interest in Fortifico Limited, a company providing a billing, CRM, and affiliate management solution to small and mid-sized businesses. During the year ended December 31, 2016, the Company incurred a charge of $4.7 million to impair the Company's 33% equity interest in Fortifico Limited, after determining that there were diminishing projected future cash flows on this investment. Investments in which the Company’s interest is less than 20.0% and which are not classified as available-for-sale securities are carried at the lower of cost or net realizable value unless it is determined that the Company exercises significant influence over the investee company, in which case the equity method of accounting is used. For those investments in which the Company’s voting interest is between 20.0% and 50.0% , the equity method of accounting is used. Under this method, the investment balance, originally recorded at cost, is adjusted to recognize the Company’s share of net earnings or losses of the investee company, as they occur, limited to the extent of the Company’s investment in, advances to and commitments for the investee. These adjustments are reflected in equity (income) loss of unconsolidated entities, net of tax in the Company’s consolidated statements of operations and comprehensive loss. The Company recognized net losses of $14.6 million and $1.3 million , and net profits of $0.1 million for the years ended December 31, 2015 , 2016 and 2017 , respectively, related to its investments. From time to time, the Company may make new and follow-on investments and may receive distributions from investee companies. As of December 31, 2017 , the Company was not obligated to fund any follow-on investments in these investee companies. As of December 31, 2017 , the Company did not have an equity method investment in which the Company’s proportionate share exceeded 10% of the Company’s consolidated assets or income from continuing operations. As of December 31, 2017 , the Company did not have an equity method investment in which the Company’s proportionate share of net losses exceeded 20% of net loss of the Company’s consolidated statement of operations and comprehensive loss.

Notes Payable

Notes Payable	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Notes Payable	Notes Payable At December 31, 2016 and 2017 , notes payable, net of original issuance discounts (sometimes referred to as "OID") and deferred financing costs, consisted of the following: As of December 31, 2016 2017 (in thousands) 2017 First Lien Term Loan $ — $ 1,563,197 2013 First Lien Term Loan 985,640 — Incremental First Lien Term Loan 674,860 — Senior Notes 326,480 329,048 Revolving Credit Facilities — — Total Notes Payable 1,986,980 1,892,245 Current portion of Notes Payable 35,700 33,945 Notes Payable - long-term $ 1,951,280 $ 1,858,300 2017 First Lien Term Loan Facility In connection with the Company's June 14, 2017 refinancing of its then-outstanding term loans (the "2017 Refinancing"), the Company entered into its current first lien term loan facility (the "2017 First Lien") with an original balance of $1,697.3 million and a maturity date of February 9, 2023. As of December 31, 2017, the 2017 First Lien had an outstanding balance of: As of December 31, 2017 (in thousands) 2017 First Lien Term Loan $ 1,605,792 Unamortized deferred financing costs (22,456 ) Unamortized original issue discount (20,139 ) Net 2017 First Lien Term Loan 1,563,197 Current portion of 2017 First Lien Term Loan 33,945 2017 First Lien Term Loan - long term $ 1,529,252 The 2017 First Lien was issued at a price of 99.75% of par and automatically bears interest at the bank’s reference rate unless the Company gives notice to opt for LIBOR-based interest rate term loans. The interest rate for a LIBOR-based interest term loan is 4.00% per annum plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan is 3.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.00% . The 2017 First Lien requires quarterly mandatory repayments of principal. During the year ended December 31, 2017, the Company made three mandatory repayments of $8.5 million each, and three voluntary prepayments for total voluntary prepayments of $66.0 million . Interest is payable on maturity of the elected interest period for a LIBOR-based interest 2017 First Lien loan, which can be one, two, three or six months. Interest is payable at the end of each fiscal quarter for a reference rate interest 2017 First Lien loan. 2013 First Lien Term Loan The Company had a prior first lien term loan facility (the “2013 First Lien”) that originated in November 2013 with an original balance of $1,050.0 million and a maturity date of November 9, 2019. As of December 31, 2016 and 2017 , the 2013 First Lien had an outstanding balance of: As of December 31, 2016 2017 (in thousands) 2013 First Lien Term Loan $ 985,875 $ — Unamortized deferred financing costs (235 ) — Net 2013 First Lien Term Loan 985,640 — Current portion of 2013 First Lien Term Loan 21,000 — 2013 First Lien Term Loan - long term $ 964,640 $ — The 2013 First Lien automatically bore interest at the bank’s reference rate unless the Company gave notice to opt for LIBOR based interest rate term loans. Prior to February 9, 2016, the interest rate for a LIBOR based interest term loan was 4.00% plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan was 3.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% and 2.00% . The 2013 First Lien bore interest at a LIBOR-based rate of 5.00% during this period. In connection with the Company's February 9, 2016 acquisition of Constant Contact and the related financing of that transaction (the "Constant Contact Financing"), the applicable margin for a LIBOR based 2013 First Lien loan increased to 5.23% per annum starting on February 9, 2016 and to 5.48% per annum starting on February 28, 2016. The applicable margin on a reference rate 2013 First Lien loan increased to 4.23% per annum starting on February 9, 2016 and to 4.48% per annum starting on February 28, 2016. The 2013 First Lien required quarterly mandatory repayments of principal, and as a result of the Constant Contact Financing, the Company was obligated to use commercially reasonable efforts to make voluntary repayments on the 2013 First Lien to effectively double the amount of each scheduled amortization payment under this facility. During the year ended December 31, 2016, the Company made mandatory repayments of $10.5 million and voluntary prepayments of $30.0 million against the 2013 First Lien. During the year ended December 31, 2017, the Company made mandatory repayments of $2.6 million and voluntary prepayments of $2.6 million against the 2013 First Lien prior to the 2017 refinancing. Interest was payable on maturity of the elected interest period for a LIBOR-based interest loan, which could be one , two , three or 6 months . Interest was payable at the end of each fiscal quarter for a reference rate 2013 First Lien loan. As part of the 2017 Refinancing, the Company refinanced the then-outstanding 2013 First Lien balance of $980.6 million . Incremental First Lien Term Loan In connection with the acquisition of Constant Contact on February 9, 2016, the Company entered into the Incremental First Lien Term Loan (the “Incremental First Lien”) in the principal amount of $735.0 million . As of December 31, 2016 and 2017, the Incremental First Lien had an outstanding balance of: As of December 31, 2016 2017 Incremental First Lien Term Loan $ 720,300 $ — Unamortized deferred financing costs (25,869 ) — Unamortized original issue discounts (19,571 ) — Net Incremental First Lien Term Loan 674,860 — Current portion of Incremental First Lien Term Loan 14,700 — Incremental First Lien Term Loan - long term $ 660,160 $ — The Incremental First Lien was issued at a price of 97.0% of par (subject to the payment of an additional upfront fee of 1.0% on February 28, 2016 under certain circumstances) and had scheduled principal payments equal to 0.50% of the original principal per quarter, or $3.7 million , starting September 30, 2016. The Incremental First Lien automatically bore interest at the bank’s reference rate unless the Company gave notice to opt for LIBOR-based interest rate term loans. Interest was payable on maturity of the elected interest period for a LIBOR-based interest loan, which could be one, two, three or six months. Interest was payable at the end of each fiscal quarter for a reference rate loan term loan. The interest rate for a LIBOR-based interest term loan was 5.00% per annum plus the greater of an adjusted LIBOR and 1.00% , and the interest rate for a reference rate term loan was 4.00% per annum plus the greatest of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR for a one-month interest period plus 1.00% , and 2.00% . During the year ended December 31, 2016, the Company made $14.7 million in mandatory and voluntary prepayments against the Incremental First Lien. During the year ended December 31, 2017, the Company made $3.7 million in mandatory prepayments against the Incremental First Lien prior to the 2017 Refinancing. As part of the 2017 Refinancing, the Company refinanced the then-outstanding Incremental First Lien balance of $716.6 million . Revolving Credit Facility The Company had a revolving credit facility of $125.0 million (the “Prior Revolver”) that originated in November 2013 and had a maturity date of December 22, 2016. The Company could elect to draw down against the Prior Revolver using a LIBOR-rate interest loan or an alternate base interest loan. The interest rate for an alternate rate base revolver loan was 5.25% per annum plus the greater of the prime rate, the federal funds effective rate plus 0.50% , an adjusted LIBOR rate or 2.25% . The interest rate for a LIBOR based revolver loan was 6.25% per annum plus the greater of the LIBOR rate or 1.50% . There was also a non-refundable fee (the "commitment fee"), equal to 0.50% of the daily unused principal amount of the revolver payable in arrears on the last day of each fiscal quarter. In connection with the Constant Contact Financing, the Company entered into a new revolving facility (the “Current Revolver”), which increased the Company’s available revolving credit to $165.0 million . The Current Revolver has a maturity date of February 9, 2021. The Current Revolver had a "springing" maturity date of August 10, 2019, which is no longer applicable as a result of the 2017 Refinancing. As of December 31, 2016 and 2017, the Company did not have any balances outstanding under the Current Revolver, and the full amount of the facility, or $165.0 million , was unused and available. The Company has the ability to draw down against the Current Revolver using a LIBOR-based interest loan or an alternate based interest loan. LIBOR-based interest revolver loans bear interest at a rate of 4.0% per annum (subject to a leverage-based step-down) plus an adjusted LIBOR for a selected interest period. Alternate base interest revolver loans bear interest at 3.0% (subject to a leverage-based step down) plus the greatest of the prime rate, the federal funds rate plus 0.50% and an adjusted LIBOR or a one-month interest period plus 1.00% . There is also a non-refundable commitment fee, equal to 0.50% of the daily unused principal amount (subject to a leverage-based step down), which is payable in arrears on the last day of each fiscal quarter. Interest is payable on maturity of the elected interest period for a LIBOR-based interest loan, which can be one, two, three or six months. Interest is payable at the end of each fiscal quarter for a reference rate revolver loan. Senior Notes In connection with the Constant Contact Financing, EIG Investors issued $350.0 million aggregate principal amount of Senior Notes (the “Notes”) with a maturity date of February 1, 2024, were issued at a price of 98.065% of par and bear interest at the rate of 10.875% per annum. The Notes have been fully and unconditionally guaranteed, on a senior unsecured basis, by the Company and its subsidiaries that guarantee the Senior Credit Facilities (including Constant Contact and certain of its subsidiaries). As of December 31, 2016 and 2017, the Senior Notes had an outstanding balance of: As of December 31, 2016 2017 (in thousands) Senior Notes $ 350,000 $ 350,000 Unamortized deferred financing costs (17,238 ) (15,280 ) Unamortized original issue discounts (6,282 ) (5,672 ) Net Senior Notes 326,480 329,048 Current portion of Senior Notes — — Senior Notes - long term $ 326,480 $ 329,048 Interest on the notes is payable twice a year, on August 1 and February 1. On January 30, 2017, the Company completed a registered exchange offer for the Notes, as required under the registration rights agreement we entered into with the initial purchasers of the Notes. All of the $350.0 million aggregate principal amount of the original notes was validly tendered for exchange as part of this exchange offer. Presentation of Debt Issuance Costs The Company adopted ASU 2015-03, “Simplifying the Presentation of Debt Issuance Costs” beginning on January 1, 2016, and retrospectively for all periods presented. ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. Unamortized balances of deferred financing costs relating to the First Lien, and unamortized balances of deferred financing costs and of original issue discounts relating to the Incremental Term Lien and the Notes are presented as a reduction of the notes payable in the Company's consolidated balance sheets. The unamortized value of deferred financing costs associated with the Company's revolving credit facility were not affected by the ASU and continue to be presented as an asset on the Company’s consolidated balance sheets. Maturity of Notes Payable The maturity of the notes payable at December 31, 2017 is as follows: Amounts Maturity date as of December 31, (in thousands) 2018 $ 33,945 2019 33,945 2020 33,945 2021 33,945 2022 33,945 Thereafter 1,436,067 Total $ 1,605,792 Interest The Company recorded $58.8 million , $152.9 million , and $157.1 million in interest expense for the years ended December 31, 2015 , 2016 and 2017 , respectively. The following table provides a summary of loan interest rates incurred and interest expense for the years ended December 31, 2015 , 2016 and 2017 : For the Year Ended December 31, 2015 2016 2017 (dollars in thousands) Interest rate—LIBOR 5.00%-7.75% 4.49%-7.75% 5.14%-6.68% Interest rate—reference 8.50 % 6.75%-8.75% * Interest rate—Notes — % 10.875 % 10.875 % Non-refundable fee—unused facility 0.50 % 0.50 % 0.50 % Interest expense and service fees $ 56,760 $ 140,470 $ 138,041 Loss on extinguishment of debt $ — $ — $ 992 Deferred financing costs immediately expensed $ — $ — $ 5,487 Amortization of deferred financing fees $ 82 $ 6,073 $ 7,316 Amortization of original issue discounts $ — $ 2,970 $ 3,860 Amortization of net present value of deferred consideration $ 1,264 $ 2,617 $ 632 Other interest expense $ 722 $ 758 $ 814 Total interest expense $ 58,828 $ 152,888 $ 157,142 * The Company did not have debt bearing interest based on the reference rate for the twelve months December 31, 2017. The Company concluded that the 2017 Refinancing was primarily a debt modification of the existing term loans in accordance with ASC 470-50, Debt: Modifications and Extinguishments, with extinguishment relating only to a few existing lenders that did not participate in the 2017 Refinancing. As a result, the Company capitalized $4.2 million of additional original issue discounts and $0.9 million of deferred financing costs related to new lenders participating in the 2017 First Lien. These capitalized costs will be amortized over the remaining life of the loan using the effective interest method. Additionally, the Company recorded a charge during the year ended December 31, 2017, included in interest expense, of $1.0 million to write off OID and deferred financing costs related to the refinanced debt for lenders not participating in the 2017 First Lien. Lastly, the Company recorded a charge of $5.5 million for the year ended December 31, 2017, included in interest expense, for deferred financing costs incurred for the 2017 First Lien that related to existing lenders that carried over from the refinanced debt. Debt Covenants The Senior Credit Facilities require that the Company complies with a financial covenant to maintain a maximum ratio of consolidated senior secured net indebtedness to an adjusted consolidated EBITDA measure. The Senior Credit Facilities also contain covenants that limit the Company's ability to, among other things, incur additional debt or issue certain preferred shares; pay dividends on or make other distributions in respect of capital stock; make other restricted payments; make certain investments; sell or transfer certain assets; create liens on certain assets to secure debt; consolidate, merge, sell or otherwise dispose of all or substantially all of its assets; and enter into certain transactions with affiliates. These covenants are subject to a number of important limitations and exceptions. Additionally, the Senior Credit Facilities require the Company to comply with certain negative covenants and specify certain events of default that could result in amounts becoming payable, in whole or in part, prior to their maturity dates. With the exception of certain equity interests and other excluded assets under the terms of the Senior Credit Facilities, substantially all of the Company's assets are pledged as collateral for the obligations under the Senior Credit Facilities. The indenture with respect to the Notes contains covenants that limit the Company's ability to, among other things, incur additional debt or issue certain preferred shares; pay dividends on or make other distributions in respect of capital stock; make other restricted payments; make certain investments; sell or transfer certain assets; create liens on certain assets to secure debt; consolidate, merge sell or otherwise dispose of all or substantially all of its assets; and enter into certain transactions with affiliates. Upon a change of control as defined in the indenture, the Company must offer to repurchase the Notes at 101% of the aggregate principal amount thereof, plus accrued and unpaid interest, if any, up to, but not including, the repurchase date. These covenants are subject to a number of important limitations and exceptions. The indenture also provides for events of default, which, if any of them occurs, may permit or, in certain circumstances, require the principal, premium, if any, interest and any other monetary obligations on all the then outstanding Notes to be due and payable immediately. The Company was in compliance with all covenants at December 31, 2017.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Preferred Stock The Company has 5,000,000 shares of authorized preferred stock, par value $0.0001 . There were no preferred shares issued or outstanding as of December 31, 2016 and 2017 . Common Stock The Company has 500,000,000 shares of authorized common stock, par value $0.0001 . Voting Rights All holders of common stock are entitled to one vote per share.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company follows the provisions of ASC 718, Compensation—Stock Compensation (“ASC 718”), which requires employee stock-based payments to be accounted for under the fair value method. Under this method, the Company is required to record compensation cost based on the estimated fair value for stock-based awards granted over the requisite service periods for the individual awards, which generally equals the vesting periods. The Company uses the straight-line amortization method for recognizing stock-based compensation expense. The Company estimates the fair value of employee stock options on the date of grant using the Black-Scholes option-pricing model, which requires the use of highly subjective estimates and assumptions. For restricted stock awards and units granted, the Company estimates the fair value of each restricted stock award and unit based on the closing trading price of its common stock on the date of grant. 2013 Stock Incentive Plan The Amended and Restated 2013 Stock Incentive Plan (the “2013 Plan”) of the Company became effective upon the closing of the Company's IPO. The 2013 Plan provides for the grant of options, stock appreciation rights, restricted stock, restricted stock units and other stock-based awards to employees, officers, directors, consultants and advisors of the Company. Under the 2013 Plan, the Company may issue up to 38,000,000 shares of the Company’s common stock. At December 31, 2017, 14,500,870 shares were available for grant under the 2013 Plan. 2011 Stock Incentive Plan As of February 9, 2016, the effective date of the acquisition of Constant Contact, the Company assumed and converted certain outstanding equity awards granted by Constant Contact under the Constant Contact 2011 Stock Incentive Plan (“2011 Plan”) prior to the effective date of the acquisition (the “Assumed Awards”) into corresponding equity awards with respect to shares of the Company’s common stock. In addition, the Company assumed certain shares of Constant Contact common stock, par value $0.01 per share, available for issuance under the 2011 Plan (the “Available Shares”), which are available for future issuance under the 2011 Plan in satisfaction of the vesting, exercise or other settlement of options and other equity awards that may be granted by the Company following the effective date of the acquisition of Constant Contact in reliance on the prior approval of the 2011 Plan by the stockholders of Constant Contact. The Assumed Awards were converted into 2,143,987 stock options and 2,202,846 restricted stock units with respect to the Company’s common stock and the Available Shares were converted into 10,000,000 shares of the Company’s common stock reserved for future awards under the 2011 Plan. At December 31, 2017, there were 9,249,168 shares available for grant under the 2011 Plan. The Company calculated the fair value of the exchanged awards in accordance with the provisions of ASC 718 as of the acquisition date. The Company allocated the fair value of these awards between the pre-acquisition and post-acquisition stock-based compensation expense. The Company determined that the value of the awards under this plan was $22.3 million , of which $5.4 million was attributed to the pre-acquisition period and recognized as part of the purchase consideration for Constant Contact. The balance of $16.9 million has been attributed to the post-acquisition period, and is being recognized in the Company’s consolidated statements of operations and comprehensive loss over the vesting period of the awards. 2013 Stock Incentive Plan For stock options issued under the 2013 Plan, the fair value of each option is estimated on the date of grant, and upon the adoption of ASU 2016-09, the Company accounts for forfeitures as they are incurred. Unless otherwise approved by the Company’s board of directors, stock options typically vest over a three - or four year period and the Company recognizes compensation expense on a straight-line basis over the requisite service period of the award. The Company uses the Black-Scholes option pricing model to estimate the fair value of stock option awards and determine the related compensation expense. The weighted-average assumptions used to compute stock-based compensation expense for awards granted under the 2013 Stock Incentive Plan during the years ended December 31, 2015, 2016 and 2017 are as follows: 2015 2016 2017 Risk-free interest rate 1.8 % 1.5 % 2.2 % Expected volatility 56.1 % 53.1 % 50.5 % Expected life (in years) 6.25 6.25 6.25 Expected dividend yield — — — The risk-free interest rate assumption was based on the U.S. Treasury zero-coupon bonds with maturities similar to those of the expected term of the award being valued. The Company bases its estimate of expected volatility using blended volatility data from the Company's common stock and from comparable public companies in similar industries and markets because there is currently limited public history for the Company’s common stock, and therefore, a lack of market-based company-specific historical and implied volatility information. The weighted-average expected life for employee options reflects the application of the simplified method, which represents the average of the contractual term of the options and the weighted-average vesting period for all option tranches. The simplified method has been used since the Company does not have sufficient historical exercise data to provide a reasonable basis upon which to estimate expected term due to a limited history of stock option grants. The assumed dividend yield was based on the Company’s expectation of not paying dividends in the foreseeable future. The following table provides a summary of the Company’s stock options as of December 31, 2017 and the stock option activity for all stock options granted under the 2013 Plan during the year ended December 31, 2017 (dollars in thousands except exercise price): Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In years) Aggregate Intrinsic Value(3) Outstanding at December 31, 2016 9,607,431 $ 12.79 Granted 774,018 $ 7.84 Exercised (672 ) $ 8.05 Forfeited (1,064,535 ) $ 12.55 Canceled (741,092 ) $ 13.69 Outstanding at December 31, 2017 8,575,150 $ 12.30 6.2 $ 470 Exercisable as of December 31, 2017 6,246,799 $ 12.80 5.5 $ 10 Expected to vest after December 31, 2017(1) 2,328,351 $ 10.96 8.1 $ 1 Exercisable as of December 31, 2017 and expected to vest thereafter(2) 8,575,150 $ 12.30 6.2 $ 470 (1) This represents the number of unvested options outstanding as of December 31, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of December 31, 2017 plus the number of unvested options outstanding as of December 31, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2017 of $8.40 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options. Restricted stock awards granted under the 2013 Plan generally vest annually over a four -year period, unless otherwise determined by the Company’s board of directors. Performance-based restricted stock awards are earned based on the achievement of performance criteria established by the Company’s compensation committee and board of directors. The following table provides a summary of the Company’s restricted stock award activity for the 2013 Plan during the year ended December 31, 2017 : Restricted Stock Awards Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 7,332,537 $ 13.21 Granted 160,428 $ 8.15 Vested (3,695,045 ) $ 12.56 Canceled (364,974 ) $ 12.13 Non-vested at December 31, 2017 3,432,946 $ 13.79 Restricted stock units granted under the 2013 Plan generally vest monthly over a three - or four -year period, unless otherwise determined by the Company’s board of directors. The following table provides a summary of the Company’s restricted stock unit activity for the 2013 Plan during the year ended December 31, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value December 31, 2016 100,369 $ 12.00 Granted 4,115,549 $ 7.94 Vested (804,920 ) $ 8.01 Canceled (406,861 ) $ 7.89 December 31, 2017 3,004,137 $ 7.93 2015 Performance Based Award The performance-based restricted stock award granted to the Company’s former chief executive officer Hari Ravichandran during 2015 provided an opportunity for the executive to earn a fully vested right to up to 3,693,754 shares of the Company’s common stock (the “Award Shares”) over a three -year period beginning July 1, 2015 and ending on June 30, 2018 (the “Performance Period”). Award Shares may have been earned based on the Company achieving pre-established, threshold, target and maximum performance metrics. Award Shares may have been earned during each calendar quarter during the Performance Period (each, a “Performance Quarter”) if the Company achieved a threshold, target or maximum level of the performance metric for the Performance Quarter. If the performance metric was less than the threshold level for a Performance Quarter, no Award Shares would have been earned during the Performance Quarter. Award Shares that were not earned during a Performance Quarter may have been earned later during the then current twelve-month period from July 1st to June 30th during the Performance Period (each, a “Performance Year”), at a threshold, target or maximum level of the performance metric for the Performance Year. For the fourth quarter of 2017, 307,812 Award Shares were earned for the Performance Quarter ending December 31, 2017 because the maximum performance level for the quarterly performance metric was met. An aggregate total of 461,958 Award Shares were earned during the year ended December 31, 2017. Any Award Shares that were earned during the Performance Period would have vested on June 30, 2018, provided that Mr. Ravichandran was employed by the Company on such date. The requirement that he be employed by the Company on June 30, 2018 would be waived in the event his employment was terminated due to death, disability or by the Company without cause, if the executive terminated employment with the Company for good reason, or if the executive was employed by the Company on the date of a change in control (as such terms are defined in the executive’s employment agreement). Upon the occurrence of any of the foregoing events, additional Award Shares may have been earned, as provided for in the performance-based restricted stock agreement. This performance-based award was evaluated quarterly to determine the probability of its vesting and to determine the amount of stock-based compensation to be recognized. During the year ended December 31, 2017 , the Company recognized $12.1 million of stock-based compensation expense related to the performance-based award. In April 2017, the Company announced that its board of directors and Mr. Ravichandran adopted a transition plan whereby Mr. Ravichandran would remain as chief executive officer and serve as a board member while the Company conducted a search to identify his successor. The Company's new president and chief executive officer began employment with the Company on August 22, 2017. Mr. Ravichandran ended his employment with the Company during the fourth quarter of 2017. In accordance with the terms of the 2015 Performance Based Award, upon separation of employment, Mr. Ravichandran received the Award Shares earned with respect to Performance Quarters completed prior to the separation, plus the greater of (a) the target number of Award Shares eligible to be earned in the Performance Quarter in which the separation occurred and (b) the number of Award Shares that would have been earned in the Performance Quarter in which the separation occurred as if Mr. Ravichandran had remained employed through the end of the Performance Quarter. Based on the actual end date of Mr. Ravichandran's employment, the Company used an attribution period of 2.39 years . An aggregate 1,661,439 earned Award Shares vested under this performance-based award and the remaining 2,032,315 unearned Award Shares were forfeited. 2016 Performance Based Awards On February 16, 2016, the compensation committee of the board of directors of the Company approved the grant of performance-based restricted stock awards to the Company’s chief financial officer (“CFO”), chief operating officer (“COO”) and chief administrative officer (“CAO”). Based on the Company's achievement of Constant Contact revenue, adjusted EBITDA and cash flow metrics, these shares vested on March 31, 2017 and each executive earned the maximum number of shares subject to his or her award. The CFO earned 223,214 shares of the Company’s stock, the COO earned 260,416 shares of the Company’s stock, and the CAO earned 148,810 shares of the Company’s stock. These earned shares vested on March 31, 2017. During the fiscal year ended December 31, 2016, the Company recognized $4.1 million of stock-based compensation expense related to these performance-based awards. During the year ended December 31, 2017, the Company recognized $1.2 million of stock-based compensation expense related to these performance-based awards. New CEO Award On August 11, 2017, the Company and Jeffrey H. Fox entered into an employment agreement (the "Employment Agreement") appointing Mr. Fox as the Company's president and chief executive officer effective upon his employment start date (the "Effective Date") of August 22, 2017. The Employment Agreement provides for Mr. Fox to receive, on the Effective Date, an equity award under the 2013 Plan with a total value of $10,375,000 as of August 11, 2017, split between and award of 1,032,500 restricted stock units (the "RSU Award") and an option to purchase 612,419 shares of the Company's common stock (the "Stock Option Grant"). Two Hundred Eighty-Two Thousand Five Hundred ( 282,500 ) of the restricted stock units subject to the RSU Award vested immediately on the Effective Date, but are subject to a requirement that Mr. Fox hold the shares underlying such restricted stock units until the earlier of the third anniversary of the Effective Date, his death or disability (as defined in the Employment Agreement) or a change in control of the company (as defined in the Employment Agreement). The Company recorded a charge of $2.2 million for these immediately vested shares during the year ended December 31, 2017 . The remaining 750,000 restricted stock units subject to the RSU Award will vest over a three -year period, with 250,000 of such restricted stock units vesting annually on the anniversary of the Effective Date. The Stock Option Grant will vest over a three -year period, with one-third of the total number of shares subject to the Stock Option Grant vesting on the first anniversary of the Effective Date and the remainder vesting in equally monthly installments thereafter. 2011 Stock Incentive Plan For stock options issued under the 2011 Plan, the fair value of each option is estimated on the date of grant. Unless otherwise approved by the Company’s board of directors, stock options typically vest over a three - or a four years period and the Company recognizes compensation expense on a straight-line basis over the requisite service period of the award. The Company uses the Black-Scholes option simplified pricing model to estimate the fair value of stock option awards and determine the related compensation expense. The weighted-average assumptions used to compute stock-based compensation expense for awards granted under the 2011 Stock Incentive Plan during the years ended December 31, 2016 and 2017 are as follows: 2016 2017 Risk-free interest rate 1.27 % 1.98 % Expected volatility 53.1 % 49.6 % Expected life (in years) 4.75 4.75 Expected dividend yield — — The following table provides a summary of the Company’s stock options as of December 31, 2017 and the stock option activity for all stock options granted under the 2011 Plan during the year ended December 31, 2017: Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In years) Aggregate Intrinsic Value(3) (In thousands) Outstanding at December 31, 2016 1,931,830 $ 8.73 Granted 14,724 $ 8.15 Exercised (355,557 ) $ 5.75 Forfeited (531,988 ) $ 10.04 Canceled (170,749 ) $ 10.62 Outstanding at December 31, 2017 888,260 $ 8.75 4.3 $ 635 Exercisable as of December 31, 2017 538,766 $ 8.40 3.8 $ 514 Expected to vest after December 31, 2017(1) 349,494 $ 9.29 5.0 $ 121 Exercisable as of December 31, 2017 and expected to vest thereafter(2) 888,260 $ 8.75 4.3 $ 635 (1) This represents the number of unvested options outstanding as of December 31, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of December 31, 2017 plus the number of unvested options outstanding as of December 31, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2017 of $8.40 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options. Unless otherwise determined by the Company’s board of directors, restricted stock units granted under the 2011 Plan generally vest annually over a three or four -year period. The following table provides a summary of the Company’s restricted stock unit activity for the 2011 Plan during the year ended December 31, 2017: Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 1,473,655 $ 9.25 Granted 1,324,328 $ 7.99 Vested (659,019 ) $ 7.56 Canceled (597,823 ) $ 8.48 Non-vested at December 31, 2017 1,541,141 $ 8.30 2016 Award Obligations At December 31, 2016, stock-based compensation expense included $0.7 million of equity award obligations pursuant to which the Company agreed to issue shares of common stock upon the achievement of certain conditions, of which $0.3 million was recorded in sales and marketing expense, $0.1 million was recorded in engineering and development expense, and $0.3 million was recorded in general and administrative expense within the consolidated statement of operations and comprehensive loss for the year ended December 31, 2016. This amount was included in accrued expenses at December 31, 2017, and would be reclassified against additional paid in capital upon issuance of the shares. During the year ended December 31, 2017, the Company incurred stock-based compensation expense of $1.2 million relating to these 2016 award obligations, all of which was recorded in sales and marketing expense within the consolidated statement of operations and comprehensive loss for the year ended December 31, 2017. All of the shares issued pursuant to the 2016 equity award obligations were issued during the year ended December 31, 2017 and were reclassified against additional paid in capital at that time. All Plans The following table presents total stock-based compensation expense recorded in the consolidated statement of operations and comprehensive loss for all 2012 restricted stock awards and units issued prior to the IPO, and all awards granted under the Company’s 2013 Plan and the 2011 Plan: For the Year Ended December 31, 2015 2016 2017 (in thousands) Cost of revenue $ 1,975 $ 5,855 $ 6,135 Sales and marketing 3,285 8,702 8,658 Engineering and development 1,988 5,989 6,090 General and administrative 22,677 37,721 39,118 Total operating expense $ 29,925 $ 58,267 $ 60,001 Under both plans combined, as of December 31, 2017 , the Company has approximately $13.7 million of unrecognized stock-based compensation expense related to option awards that will be recognized over 2.0 years and approximately $37.1 million of unrecognized stock-based compensation expense related to restricted stock awards and units that will be recognized over approximately 2.2 years .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The components of accumulated other comprehensive loss, net of tax were as follows: Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Total (in thousands) Balance at December 31, 2015 $ (1,798 ) $ 80 $ (1,718 ) Other comprehensive income (loss) (597 ) (1,351 ) (1,948 ) Balance at December 31, 2016 (2,395 ) (1,271 ) (3,666 ) Other comprehensive income (loss) 3,091 34 3,125 Balance at December 31, 2017 $ 696 $ (1,237 ) $ (541 )

Redeemable Non-Controlling Inte

Redeemable Non-Controlling Interest	12 Months Ended
	Dec. 31, 2017
Noncontrolling Interest [Abstract]
Redeemable Non-Controlling Interest	Redeemable Non-Controlling Interest In connection with a 2014 equity investment in WZ UK, on January 6, 2016, the Company exercised its option to increase its stake in WZ UK from 49.0% to 57.5% , thereby acquiring a controlling interest, in exchange for a payment of approximately $2.1 million to the other shareholders of WZ UK. The agreement related to the transaction provides for a put option for the then NCI shareholders to put the remaining equity interest to the Company within pre-specified put periods. As the NCI is subject to a put option that is outside the control of the Company, it is deemed a redeemable non-controlling interest and is not recorded in permanent equity, and is presented as mezzanine redeemable non-controlling interest on the consolidated balance sheet, and is subject to the guidance of the Securities and Exchange Commission (“SEC”) under ASC 480-10-S99, Accounting for Redeemable Equity Securities. The difference between the $10.8 million fair value of the redeemable NCI and the $30 million value that is expected to be paid upon exercise of the put option was being accreted over the period commencing January 6, 2016 and up to the first put option period, which commenced on the 24 months anniversary of the acquisition date, August 14, 2016. Adjustments to the carrying amount of the redeemable non-controlling interest were charged to additional paid-in capital. In January 2016, the Company obtained a controlling interest in Resume Labs Limited for $1.5 million and Pseudio Limited for $1.5 million . The agreements related to these transactions provide for put options for the NCI shareholders of each company to put the remaining equity interest to the Company within pre-specified put periods. As the NCI for these entities were subject to put options that are outside the control of the Company, they were deemed redeemable non-controlling interests and were also not recorded in permanent equity, and were presented as part of the mezzanine redeemable non-controlling interest on the consolidated balance sheet. On May 16, 2016, the Company amended the put option with respect to WZ UK to allow it to acquire an additional equity interest in WZ UK earlier than August 2016. Pursuant to this amended option, on the same date the Company acquired an additional 20.0% stake in WZ UK for $15.4 million , thus increasing its ownership interest from 57.5% to 77.5% . On July 13, 2016, WZ UK completed a restructuring pursuant to which Pseudio Limited and Resume Labs Limited became wholly owned subsidiaries of WZ UK. As a result of the restructuring, WZ UK became the 100.0% owner of Pseudio Limited and Resume Labs Limited and the Company’s ownership of WZ UK was diluted from 77.5% to 76.4% . Immediately subsequent to the restructuring, the Company acquired an additional 10.0% stake in WZ UK on July 13, 2016 for $18 million , bringing the Company’s aggregate stake in WZ UK to 86.4% . The restructuring significantly reduced the amount of the potential redemption amount payable to the minority shareholders of WZ UK, and gave the Company the flexibility to reduce investments in this business. Based on these reduced investments, and based on the Company's fair value measurement of the NCI using market multiples and discounted cash flows, the Company determined that the estimated fair value of the non-controlling interest was below the expected redemption amount of $25.0 million , which resulted in $14.2 million of excess accretion that reduced income available to common shareholders for the period starting on the date of the restructuring through the redemption date of July 1, 2017. The Company recognized excess accretion of $6.8 million and $7.2 million during the year ended December 31, 2016 and 2017, respectively, which is reflected in net loss attributable to accretion of non-controlling interest in the Company’s consolidated statements of operations and comprehensive loss. Prior to the third quarter of 2016, the Company did not have any accretion amounts in excess of fair value. On July 7, 2017, the Company redeemed the remaining redeemable non-controlling interest for $25.0 million . The following table presents changes in this redeemable non-controlling interest: Redeemable noncontrolling interest (in thousands) Balance as of December 31, 2016 $ 17,753 Accretion in excess of fair value 7,247 Payment of redeemable non-controlling interest (25,000 ) Balance as of December 31, 2017 $ — The Company starts accreting non-controlling interest to its redeemable value from the date the redemption of the non-controlling interest becomes probable through the earliest redemption date. If the non-controlling interest is redeemable at an amount higher than its fair value, the excess accretion is taken into consideration in the calculation of loss per share.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company accounts for income taxes in accordance with authoritative guidance, which requires the use of the asset and liability method. Under this method, deferred income tax assets and liabilities are determined based upon the difference between the consolidated financial statement carrying amounts and the tax basis of assets and liabilities and are measured using the enacted tax rate expected to apply in the years in which the differences are expected to be reversed. The following table presents domestic and foreign components of income (loss) before income taxes for the periods presented: Year Ended December 31, 2015 2016 2017 (in thousands) United States $ 1,258 $ (137,197 ) $ (117,715 ) Foreign (1,046 ) (52,593 ) 540 Total income (loss) before income taxes $ 212 $ (189,790 ) $ (117,175 ) The components of the provision (benefit) for income taxes consisted of the following: Year Ended December 31, 2015 2016 2017 (in thousands) Current: U.S. federal $ 1,827 $ 328 $ 319 State 696 744 2,610 Foreign 1,699 2,312 2,597 Total current provision 4,222 3,384 5,526 Deferred: U.S. federal (1,103 ) (44,447 ) (36,854 ) State 1,952 (6,225 ) (3,243 ) Foreign (818 ) (10,037 ) 9,377 Change in valuation allowance 7,089 (52,533 ) 7,913 Total deferred provision 7,120 (113,242 ) (22,807 ) Total expense (benefit) $ 11,342 $ (109,858 ) $ (17,281 ) The Company established a valuation allowance on substantially all of its deferred tax assets during the year ended December 31, 2013. The benefit had been reduced after the establishment of the valuation allowance by the deferred tax expense associated with the tax amortization of assets that have an indefinite life for U.S. GAAP purposes. The Company maintained a valuation allowance against certain U.S. deferred tax assets until the acquisition of Constant Contact. The acquisition of Constant Contact resulted in a significant increase in deferred tax liabilities, which far exceeded deferred tax assets. The Company scheduled out the reversal of the consolidated U.S. deferred tax assets and liabilities as of March 31, 2016, and determined that these reversals would be sufficient to realize most domestic deferred tax assets. The deferred tax liabilities supporting the realizability of these deferred tax assets will reverse in the same period, are in the same jurisdiction and are of the same character as the temporary differences that gave rise to these deferred tax assets. As a result, the Company recorded a deferred tax benefit to reverse the valuation allowances during the year ended December 31, 2016. The Company recorded a valuation allowance against the majority of the state research and development tax credits and state investment tax credits, a portion of state operating loss credit carry-forwards, federal and state capital loss carry-forwards, and federal research credits which the Company projected to expire prior to utilization. During the year ended December 31, 2017, the Company recorded a deferred tax benefit of $22.8 million , which was mostly attributable to the lower tax rates from the 2017 Tax and Jobs Act. The following table presents a reconciliation of the statutory federal rate, and the Company’s effective tax rate, for the periods presented: Year Ended December 31, 2015 2016 2017 U.S. federal taxes at statutory rate 34.0 % 35.0 % 35.0 % State income taxes, net of federal benefit 685.0 0.9 0.6 Nondeductible stock-based compensation 827.3 (1.5 ) (7.9 ) Nondeductible litigation expenses — — (7.9 ) Nondeductible transaction costs 856.5 (2.9 ) — Nontaxable gain on redemption of equity interest (674.9 ) — — Other foreign permanent differences 187.8 (0.4 ) (2.9 ) Credits — 3.7 1.1 Foreign rate differential 299.7 (4.6 ) 1.2 Change in valuation allowance—U.S. 3,398.6 31.2 (16.1 ) Change in valuation allowance—foreign (130.8 ) (4.1 ) 9.5 Rate change 216.5 0.4 7.5 Prior year true-up stock-based compensation—U.S. (132.8 ) — — Other (217.5 ) (0.5 ) (5.2 ) Total 5,349.4 % 57.2 % 14.9 % The favorable impact of the change in valuation allowance in the U.S., which reduced the Company's effective rate by 16.1% , was mostly attributable to the enactment of lower tax rates as part of the 2017 Tax and Jobs Act. The provision (benefit) for income taxes shown on the consolidated statements of operations differs from amounts that would result from applying the statutory tax rates to income before taxes primarily because of the release of the valuation allowance on U.S. deferred tax assets, state income taxes, the impact of changes in state apportionment, jurisdiction mix of earnings, nondeductible expenses, as well as the application of valuation allowances against foreign deferred tax assets. The significant components of the Company’s deferred income tax assets and liabilities are as follows: As of December 31, 2016 2017 Deferred income tax assets: Net operating loss carry forward $ 76,060 $ 47,098 Credit carryforward 28,271 27,337 Other 5,414 (327 ) Deferred compensation 364 215 Deferred revenue 26,291 19,729 Other reserves 3,545 (72 ) Stock-based compensation 25,424 14,887 Total deferred income tax assets 165,369 108,867 Deferred income tax liabilities: Purchased intangible assets (119,719 ) (47,580 ) Goodwill (37,099 ) (27,922 ) Property and equipment (12,403 ) (9,024 ) Total deferred income tax liabilities (169,221 ) (84,526 ) Valuation allowance (36,091 ) (44,068 ) Net deferred income tax liabilities $ (39,943 ) $ (19,727 ) The Company conducts business globally and, as a result, its subsidiaries file income tax returns in U.S. federal and state jurisdictions and various foreign jurisdictions. In the normal course of business, the Company may be subject to examination by taxing authorities throughout the world, including such major jurisdictions as Brazil, India, the United Kingdom, the Netherlands and the United States. In the normal course of business, the Company is subject to examination by tax authorities throughout the world. Since the Company is in a loss carry-forward position, the Company is generally subject to U.S. federal and state income tax examinations by tax authorities for all years for which a loss carry-forward is utilized. The Company's Constant Contact subsidiary is currently under an Internal Revenue Service audit in the United states for the periods ended December 31, 2015 and February 9, 2016 (short period), India for fiscal years ended March 31, 2014 and 2015 and Israel for the fiscal years ended December 31, 2012, 2013, 2014 and 2015. At this time, the Company does not expect material changes as a result of the audits. The statute of limitations in the Company’s other tax jurisdictions, in the United Kingdom and Brazil, remains open for various periods between 2011 and the present. However, carryforward attributes from prior years may still be adjusted upon examination by tax authorities if they are used in an open period. The Company recognizes, in its consolidated financial statements, the effect of a tax position when it is more likely than not, based on the technical merits, that the position will be sustained upon examination. The Company has unrecognized tax benefits for uncertain tax positions of $0.0 million and $1.1 million at December 31, 2016 and 2017, respectively, that would affect its effective tax rate. The Company records interest related to unrecognized tax benefits in interest expense and penalties in operating expense. The Company recognized immaterial interest and penalties related to unrecognized tax benefits during the years ended December 31, 2015, 2016 and 2017. The Company does not expect a significant change in the liability for unrecognized tax benefits in the next 12 months. Unrecognized tax benefits at December 31, 2016 $ — Addition for tax positions of prior years 734 Addition for tax positions of current year 395 Unrecognized tax benefits at December 31, 2017 $ 1,129 The Company regularly assesses its ability to realize its deferred tax assets. Assessing the realization of deferred tax assets requires significant management judgment. In determining whether its deferred tax assets are more likely than not realizable, the Company evaluated all available positive and negative evidence, and weighted the evidence based on its objectivity. Evidence the Company considered included: • Net Operating Losses (“NOL”) incurred from the Company’s inception to December 31, 2017 ; • Expiration of various federal and state tax attributes; • Reversals of existing temporary differences; • Composition and cumulative amounts of existing temporary differences; and • Forecasted profit before tax. Prior to the acquisition of Constant Contact, the Company maintained a valuation allowance against certain deferred tax assets. The acquisition of Constant Contact resulted in a significant increase in deferred tax liabilities, which far exceeded pre-acquisition deferred tax assets. The Company, with the significant deferred tax liabilities resulting from the acquisition, scheduled out the reversal of the consolidated U.S. deferred tax assets and liabilities as of March 31, 2016, and determined that these reversals would be sufficient to realize most domestic deferred tax assets. The deferred tax liabilities supporting the realizability of these deferred tax assets in the acquisition will reverse in the same period, are in the same jurisdiction and are of the same character as the temporary differences that gave rise to these deferred tax assets. The Company maintained a valuation allowance on the acquired Massachusetts research and development tax credits and limited life investment tax credit carry-forwards and a portion of the acquired Colorado and Utah operating loss carry-forwards. The Company maintained its valuation allowance on the several of the legacy state net operating loss carry-forwards expected to expire unused as a result of the scheduling analysis. As a result, the Company recorded a tax benefit of $70.6 million to reverse valuation allowances during the year ended December 31, 2016. The Company performed a deferred scheduling analysis as of December 31, 2016, and as a result recorded a valuation allowance against $7.8 million of federal research credits, $1.2 million of federal and state capital loss carry-forwards, and $1.0 million of additional state net operating losses, which resulted in Company recording an increase in tax expense of $10.0 million related to the increase in the U.S. valuation allowance. The Company assessed its ability to realize its U.S. deferred tax assets as of December 31, 2017 and determined that it was more likely than not that the Company would not realize $37.9 million of net deferred tax assets. The Company assessed its ability to realize its foreign deferred tax assets as of December 31, 2017 and determined that it was more likely than not that the Company would not realize $2.4 million of net deferred tax assets in the United Kingdom, $3.4 million of net deferred tax assets in the Netherlands, $0.0 million of net deferred tax assets in Singapore, $0.2 million of net deferred tax assets in Israel, and $0.2 million of net deferred tax assets in China. For the years ended December 31, 2015 , 2016 and 2017 , the Company has recognized a tax expense (benefit) of $11.3 million , $(109.9) million and $(17.3) million , respectively, in the consolidated statements of operations and comprehensive loss. The income tax benefit for the year ended December 31, 2017 was primarily attributable to a federal and state deferred tax benefit of $21.8 million (which includes a $16.9 million tax benefit pertaining to the federal tax rate change as a result of the Tax Cut and Jobs Act of 2017 and the identification and recognition of $1.2 million of U.S. federal and state tax credits) and a foreign deferred tax benefit of $1.0 million , offset by a provision for federal and state current income taxes of $1.8 million , a reserve of $1.1 million for unrecognized tax benefits, and foreign current tax expense of $2.6 million . The income tax expense for the year ended December 31, 2016 is primarily attributable to a provision for federal and state current income taxes of $1.1 million , foreign current tax expense of $2.3 million , federal and state deferred tax benefit of $111.2 million , which is attributable to the $70.6 million release of valuation allowance and $40.6 million of deferred tax benefit related to an increase in deferred tax assets, and foreign deferred benefit of $2.0 million related to the reductions of deferred liabilities created in purchase accounting. The income tax expense for the year ended December 31, 2015 is primarily attributable to a provision for federal and state current income taxes of $2.5 million , foreign current tax expense of $1.7 million , federal and state deferred tax expense of $0.8 million and attributable to a $7.1 million increase in the valuation allowance, partially offset by a foreign deferred benefit of $0.8 million related to the reduction of deferred liabilities to fair value as as result of purchase accounting. As of December 31, 2017 , the Company had NOL carry-forwards available to offset future U.S. federal taxable income of approximately $157.6 million and future state taxable income of approximately $128.6 million . These NOL carry-forwards expire on various dates through 2037. As of December 31, 2017, the Company had NOL carry-forwards in foreign jurisdictions available to offset future foreign taxable income by approximately $26.7 million . The Company has loss carry-forwards that begin to expire in 2021 in China totaling $0.7 million . The Company has loss carry-forwards that begin to expire in 2020 in the Netherlands totaling $12.6 million . The Company also has loss carry-forwards in the United Kingdom and Singapore of $13.2 million and $0.2 million , respectively, which have an indefinite carry-forward period. In addition, the Company has $3.4 million of U.S. federal capital loss carry-forwards and $1.4 million in state capital loss-forwards, generally expiring through 2021. As of December 31, 2017, the Company had U.S. tax credit carry-forwards available to offset future U.S. federal and state taxes of approximately $17.6 million and $12.3 million , respectively. These credit carry-forwards expire on various dates through 2037. Utilization of the NOL carry-forwards may be subject to an annual limitation due to the ownership percentage change limitations under Section 382 of the Internal Revenue Code (“Section 382 limitation”). Ownership changes can limit the amount of net operating loss and other tax attributes that a company can use each year to offset future taxable income and taxes payable. In connection with a change in control in 2011, the Company was subject to Section 382 annual limitations of $77.1 million against the balance of NOL carry-forwards generated prior to the change in control in 2011. Through December 31, 2013, the Company accumulated the unused amount of Section 382 limitations in excess of the amount of NOL carry-forwards that were originally subject to limitation. Therefore, these unused NOL carry-forwards are available for future use to offset taxable income. The Company has completed an analysis of changes in its ownership from 2011, through its IPO, to December 31, 2013. The Company concluded that there was not a Section 382 ownership change during this period and therefore any NOLs generated through December 31, 2013, are not subject to any new Section 382 annual limitations on NOL carry-forwards. On November 20, 2014, the Company completed a follow-on offering of 13,000,000 shares of common stock. The underwriters also exercised their overallotment option to purchase an additional 1,950,000 shares of common stock from the selling stockholders. The Company performed an analysis of the impact of this offering and determined that no Section 382 change in ownership had occurred. On March 11, 2015, the Company closed a follow-on offering of its common stock, in which selling stockholders sold 12,000,000 shares of common stock at a public offering price of $19.00 per share. The underwriter also exercised its overallotment option to purchase an additional 1,800,000 shares of common stock from the selling stockholders. The Company completed an analysis of its ownership changes in the first half of 2016, which resulted in no ownership-change for tax purposes within the meaning of the Internal Revenue Code Section 382(g). As of the date of the Company’s acquisition of Constant Contact, Constant Contact had approximately $60.2 million and $32.4 million of federal and state NOLs, respectively, and approximately $10.9 million of U.S. federal research and development credits and $9.2 million of state credits. These losses and credits are not subject to limitation under Internal Revenue Code Sections 382 and 383. As a result, all unused NOL carry-forwards at December 31, 2017 are available for future use to offset taxable income. Permanent Reinvestment of Foreign Earnings As of December 31, 2017, the cumulative amount of undistributed earnings of the Company's foreign subsidiaries amounted to $24.8 million . The Company has not provided U.S. taxes on these undistributed earnings of its foreign subsidiaries that it considers indefinitely reinvested. This indefinite reinvestment determination is based on the future operational and capital requirements of the Company's domestic and foreign operations. The Company expects that the cash held by its foreign subsidiaries of $11.3 million will continue to be used for its foreign operations and therefore does not anticipate repatriating these funds. I ncluded within the Tax Cuts and Jobs Act of 2017 were changes to Subpart F rules and a requirement for taxation of the aggregate net unrepatriated foreign earnings accumulated before January 1, 2018. These changes did not impact the Company in 2017 and we do not expect the Subpart F changes to have a material impact in the future. Except for Subpart F income, the Company has not provided taxes for the remaining $24.8 million of undistributed earnings of its profitable foreign subsidiaries because we plan to keep these amounts permanently reinvested overseas except for instances where we can remit such earnings to the U.S. without an associated net tax cost. If the Company decides to repatriate the foreign earnings, it would need to adjust its income tax provision in the period it determines that the earnings will no longer be indefinitely invested outside the United States. Due to the timing and circumstances of repatriation of such earnings, if any, it is not practicable to determine the unrecognized deferred tax liability relating to such amounts. Adoption of ASU 2016-09 In March 2016, the FASB issued ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 intends to simplify various aspects of how share-based payments are accounted for and presented in the financial statements. The main provisions include: all tax effects related to stock awards will now be recorded through the income statement instead of through equity, all tax-related cash flows resulting from stock awards will be reported as operating activities on the cash flow statement, and entities can make an accounting policy election to either estimate forfeitures or account for forfeitures as they occur. The amendments in ASU 2016-09, required to be updated for all annual periods and interim reporting periods beginning after December 15, 2016, were adopted early by the Company in the fourth quarter of 2016 and were applied to its related consolidated financial statements on a prospective basis. The adoption of these amendments had an impact of $0.9 million on the consolidated statement of operations and comprehensive loss through December 31, 2016 due to the reclassification of shortfalls from additional paid in capital. The Company also elected to account for forfeitures as they occur with no adjustment for estimated forfeitures, which had an impact of $0.9 million to the Company’s consolidated statement of operations and comprehensive loss. As previously mentioned, as a result of prior guidance that required excess tax benefits reduce taxes payable prior to recognition as an increase in paid in capital, the Company had not recognized certain deferred tax assets (loss carry-forwards) that could be attributed to tax deductions related to equity compensation in excess of compensation recognized for financial reporting. As of January 1, 2016, the Company had generated U.S. federal and state net operating loss carry-forwards due to excess tax benefits of $1.5 million and $0.7 million , respectively. Tax Cuts and Jobs Act On December 22, 2017, the United States enacted tax reform legislation through the Tax Cuts and Jobs Act,which significantly changes the existing U.S. tax laws, including a reduction in the corporate tax rate from 35% to 21%, a move from a worldwide tax system to a territorial system, as well as other changes. As a result of enactment of the legislation, we incurred an additional one-time income tax benefit on the re-measurement of certain deferred tax assets and liabilities in the amount of $16.9 million . The legislation also introduced substantial international tax reform that moves the U.S. toward a territorial system, in which income earned in other countries will generally not be subject to U.S. taxation. The accumulated foreign earnings of U.S. shareholders of certain foreign corporations will be subject to a one-time transition tax. Amounts held in cash or cash equivalents will be subject to a 15.5 percent tax, while amounts held in illiquid assets will be subject to an eight percent tax. Due to an accumulated deficit in the undistributed earnings of its foreign subsidiaries, the one-time transition tax will not apply to the Company. Although the Company has substantially completed its work on the effects of the Tax Reform Act, management continues to evaluate certain sections of the new law that may be pertinent to the Company's tax situation.

Severance and Other Exit Costs

Severance and Other Exit Costs	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Severance and Other Exit Costs	Severance and Other Exit Costs The Company evaluates its data center, sales and marketing, support and engineering operations and the general and administrative function on an ongoing basis in an effort to optimize its cost structure. As a result, the Company may incur charges for employee severance, exiting facilities and restructuring data center commitments and other related costs. 2017 Restructuring Plan In January 2017, the Company announced plans to close certain offices as part of a plan to consolidate certain web presence customer support operations, resulting in severance costs. These severance charges were associated with the elimination of approximately 660 positions, primarily in customer support. Additionally, the Company implemented additional restructuring plans to create operational efficiencies and synergies related to the Constant Contact acquisition, which resulted in additional severance charges for the elimination of approximately 50 positions. For the year ended December 31, 2017 , in connection with these plans (together, the “2017 Restructuring Plan”), the Company incurred severance costs of $13.1 million and paid $9.4 million . The Company had a remaining accrued severance liability of $3.7 million as of December 31, 2017 . In connection with the 2017 Restructuring Plan, the Company closed offices in Orem, Utah and relocated certain employees to its Tempe, Arizona office. During the year ended December 31, 2017 , the Company incurred facility charges of $1.3 million . The Company made payments of $1.0 million during the year ended December 31, 2017 , and had a remaining accrued facility liability of $0.3 million as of December 31, 2017 . The Company expects to complete severance payments related to the 2017 Restructuring Plan during the year ended December 31, 2018. 2016 Restructuring Plan In connection with the Company’s acquisition of Constant Contact on February 9, 2016, the Company implemented a plan to create operational efficiencies and synergies resulting in severance costs and facility exit costs (the “2016 Restructuring Plan”). The severance charges were associated with eliminating approximately 265 positions across the business. The Company incurred all employee-related charges associated with the 2016 Restructuring Plan during the year ended December 31, 2016 and all severance payments were complete at December 31, 2017 . The Company paid $1.6 million of severance costs during the year ended December 31, 2017 . There is no severance accrual remaining as of December 31, 2017 . The 2016 Restructuring Plan included a plan to close offices in San Francisco, California, Delray Beach, Florida, New York, New York, United Kingdom, Porto Alegre, Brazil and Miami, Florida, and a plan to relocate certain employees to its Austin Office. The Company also closed a portion of the Constant Contact offices in Waltham, Massachusetts. During the year ended December 31, 2017, the Company recorded an adjustment to the Waltham facilities charge for future lease payments of $1.4 million , due to a change in estimated sublease income. The Company paid $4.6 million of facility costs related to the 2016 Restructuring Plan during the year ended December 31, 2017 and had a remaining accrued facility liability of $5.6 million as of December 31, 2017. Other than the adjustment mentioned above, the Company completed facility-related charges associated with the 2016 Restructuring Plan during the year ended December 31, 2016, and expects to complete facility exit cost payments related to the plan during the year ended December 31, 2022. 2014 Restructuring Plan During the year ended December 31, 2014, the Company implemented plans to further integrate and consolidate its data center, support and engineering operations, resulting in severance and facility costs. The employee related charges associated with these restructuring were completed during the year ended December 31, 2014. As of December 31, 2017 , the Company did not have any remaining accrued employee severance related to these severance costs. The Company had incurred facility costs associated with closing offices in Redwood City, California and Englewood, Colorado. At the time of closing these offices, the Company had remaining lease obligations of approximately $3.0 million for these vacated facilities through March 31, 2018. During the year ended December 31, 2017 , the Company paid $0.8 million of facility costs and received sublease income of $0.7 million, and had a remaining accrued facility liability of $0.1 million as of December 31, 2017 . The Company expects to complete facility exit cost payments related to the plan during the year ended December 31, 2018. The following table provides a summary of the aggregate activity for the year ended December 31, 2017 related to the Company’s combined severance accrual for the 2017, 2016 and 2014 Restructuring Plans (together, the "Restructuring Plans"): Employee Severance (in thousands) Total Balance at December 31, 2016 $ 1,559 Severance charges 13,110 Cash paid (11,001 ) Balance at December 31, 2017 $ 3,668 The following table provides a summary of the aggregate activity for the year ended December 31, 2017 related to the Company’s combined Restructuring Plans facilities exit accrual: Facilities (in thousands) Total Balance at December 31, 2016 $ 9,020 Facility charges, net of estimated sublease income 2,700 Sublease income received 698 Cash paid (6,413 ) Balance at December 31, 2017 $ 6,005 The following table presents restructuring charges recorded in the consolidated statement of operations and comprehensive loss for the periods presented: For the Year Ended December 31, 2015 2016 2017 (in thousands) Cost of revenue $ (45 ) $ 8,986 $ 4,100 Sales and marketing 555 6,550 3,586 Engineering and development 636 4,288 1,469 General and administrative 343 4,400 6,655 Total severance charges $ 1,489 $ 24,224 $ 15,810

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases The Company has operating lease commitments for certain facilities and equipment that expire on various dates through 2026 . The following table outlines future minimum annual rental payments under these leases at December 31, 2017 : Year Ending December 31, Amount (in thousands) 2018 $ 21,526 2019 20,212 2020 19,633 2021 16,205 2022 13,772 Thereafter 36,612 Total minimum lease payments $ 127,960 Total net rent expense incurred under non-cancellable operating leases for the years ended December 31, 2015 , 2016 and 2017 , were $8.2 million , $20.0 million and $22.1 million , respectively. Total sublease income for the years ended December 31, 2015, 2016 and 2017 was $0.2 million , $0.4 million and $0.5 million , respectively. Contingencies From time to time, the Company is involved in legal proceedings or subject to claims arising in the ordinary course of its business. The Company is not presently involved in any such legal proceeding or subject to any such claim that, in the opinion of its management, would have a material adverse effect on its business, operating results or financial condition. However, the results of such legal proceedings or claims cannot be predicted with certainty, and regardless of the outcome, can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors. Neither the ultimate outcome of the matters listed below nor an estimate of any probable losses or any reasonably possible losses (other than the SEC investigations reserve discussed below) can be assessed at this time. On May 4, 2015, Christopher Machado, a purported holder of the Company’s common stock, filed a civil action in the United States District Court for the District of Massachusetts against the Company and its former chief executive officer and former chief financial officer, captioned Machado v. Endurance International Group Holdings, Inc., et al, Civil Action No. 1:15-cv-11775-GAO. T he plaintiff filed an amended complaint on December 8, 2015, and a second amended complaint on March 18, 2016. The Company moved to dismiss the second amended complaint, but before the court ruled on this motion, with the Company's assent, the plaintiff filed a third amended complaint on June 30, 2017. In the third amended complaint, plaintiffs Christopher Machado and Michael Rubin allege claims for violations of Section 10(b) and 20(a) of the Exchange Act, and Sections 11, 12(a)(2), and 15 of the Securities Act, on behalf of a purported class of purchasers of the Company's securities between October 25, 2013 and December 16, 2015, including persons or entities who purchased or acquired the Company's shares pursuant or traceable to the registration statement and prospectus issued in connection with the Company's October 25, 2013 initial public offering. The plaintiffs challenge as false or misleading certain of the Company's disclosures about the total number of subscribers, average revenue per subscriber, the number of customers paying over $500 per year for Company products and services, and the average number of products sold per subscriber. The plaintiffs seek, on behalf of themselves and the purported class, compensatory damages, rescissory damages as to class members who purchased shares pursuant to the offering and the plaintiffs' costs and expenses of litigation. The Company moved to dismiss the third amended complaint on August 29, 2017. The plaintiffs' memorandum in opposition to the Company's motion to dismiss was filed on October 30, 2017, and the Company's reply memorandum was filed on December 14, 2017. On January 12, 2018, the parties filed a joint motion to stay all proceedings pending the outcome of a mediation between the parties scheduled for February 23, 2018. The Company and the individual defendants intend to deny any liability or wrongdoing and to vigorously defend all claims asserted. The Company cannot, however, make any assurances as to the outcome of the proceeding. The Company received a subpoena dated December 10, 2015 from the Boston Regional Office of the SEC, requiring the production of certain documents, including, among other things, documents related to its financial reporting, including operating and non-GAAP metrics, refund, sales and marketing practices and transactions with related parties. The Company is fully cooperating with the SEC’s investigation. The Company is also in discussions with the Boston Regional Office regarding a potential resolution of its investigation, and has reserved $8.0 million in connection with a potential resolution of both this investigation and the Constant Contact investigation discussed below. The Company can make no assurances as to whether the investigation will be resolved by agreement and/or the time or resources that will need to be devoted to this investigation or its final outcome, or the impact, if any, of this investigation or any related legal or regulatory proceedings on its business, financial condition, results of operations and cash flows. Constant Contact On October 30, 2015, the Company entered into a definitive agreement pursuant to which it agreed to acquire all of the outstanding shares of common stock of Constant Contact. The acquisition closed on February 9, 2016. Constant Contact contingencies are noted below. On December 10, 2015, Constant Contact received a subpoena from the Boston Regional Office of the SEC, requiring the production of documents pertaining to Constant Contact’s sales, marketing, and customer retention practices, as well as periodic public disclosure of financial and operating metrics. The Company is fully cooperating with the SEC’s investigation. As discussed above, the Company is in discussions with the Boston Regional Office regarding a potential resolution of its investigation, and has reserved $8 million in connection with a potential resolution of both this investigation and the Endurance investigation discussed above. The Company currently expects that any settlement arising from the SEC investigation of Constant Contact will involve asserted scienter-based claims. The Company can make no assurances as to whether the investigation will be resolved by agreement and/or the time or resources that will need to be devoted to this investigation or its final outcome, or the impact, if any, of this investigation or any related legal or regulatory proceedings on its business, financial condition, results of operations and cash flows. On August 7, 2015, a purported class action lawsuit, William McGee v. Constant Contact, Inc., et al, was filed in the United States District Court for the District of Massachusetts against Constant Contact and two of its former officers. An amended complaint, which named an additional former officer as a defendant, was filed December 19, 2016. The lawsuit asserts claims under Sections 10(b) and 20(a) of the Exchange Act, and is premised on allegedly false and/or misleading statements, and nondisclosure of material facts, regarding Constant Contact’s business, operations, prospects and performance during the proposed class period of October 23, 2014 to July 23, 2015. This litigation remains in its early stages. The Company and the individual defendants intend to vigorously defend all claims asserted. The Company cannot, however, make any assurances as to the outcome of this proceeding. In August 2012, RPost Holdings, Inc., RPost Communications Limited and RMail Limited, or collectively, RPost, filed a complaint in the United States District Court for the Eastern District of Texas that named Constant Contact as a defendant in a lawsuit. The complaint alleged that certain elements of Constant Contact’s email marketing technology infringe five patents held by RPost. RPost sought an award for damages in an unspecified amount and injunctive relief. In February 2013, RPost amended its complaint to name five of Constant Contact’s marketing partners as defendants. Under Constant Contact’s contractual agreements with these marketing partners, Constant Contact is obligated to indemnify them for claims related to patent infringement. Constant Contact filed a motion to sever and stay the claims against its partners and multiple motions to dismiss the claims against it. In January 2014, the case was stayed pending the resolution of certain state court and bankruptcy actions involving RPost, to which Constant Contact is not a party. Meanwhile, RPost asserted the same patents it asserted against Constant Contact in litigation against GoDaddy. In June 2016, GoDaddy succeeded in invalidating all of those RPost patents, with Endurance filing an amicus brief in the Federal Circuit in support of GoDaddy’s position in November 2016. RPost’s efforts to appeal, including filing a writ of certiorari with the United States Supreme Court, which was denied on December 11, 2017, were unsuccessful. All claims asserted by RPost against Constant Contact in December 2012 thus remain invalid except for one claim from one patent which RPost did not assert against GoDaddy. Constant Contact has notified RPost that Constant Contact believes the remaining claim is invalid in light of the other litigation that RPost lost. On December 12, 2017, Constant Contact moved to lift the stay in the District Court order to file a Motion for Judgment on the Pleadings invalidating all of the RPost patents-in-suit. While this motion was pending, RPost voluntarily dismissed all of its patent claims against Constant Contact and the defendant marketing partners of Constant Contact on December 29, 2017. On January 19, 2018, the district court entered an order dismissing the lawsuit. On December 11, 2015, a putative class action lawsuit relating to the Constant Contact acquisition, captioned Irfan Chawdry, Individually and On Behalf of All Others Similarly Situated v. Gail Goodman, et al. Case No. 11797, and on December 21, 2015, a putative class action lawsuit relating to the acquisition captioned David V. Myers, Individually and On Behalf of All Others Similarly Situated v. Gail Goodman, et al. Case No. 11828 (together, the “Complaints”) were filed in the Court of Chancery of the State of Delaware, naming Constant Contact, each of Constant Contact’s directors, Endurance and Paintbrush Acquisition Corporation as defendants. The Complaints generally alleged, among other things, that in connection with the acquisition the directors of Constant Contact breached their fiduciary duties owed to the stockholders of Constant Contact by agreeing to sell Constant Contact for purportedly inadequate consideration, engaging in a flawed sales process, omitting material information necessary for stockholders to make an informed vote, and agreeing to a number of purportedly preclusive deal protection devices. The Complaints sought, among other things, to rescind the acquisition, as well as an award of plaintiffs’ attorneys’ fees and costs in the action. The Complaints were consolidated on January 12, 2016. On December 5, 2016, plaintiff Myers filed a consolidated amended complaint (the “Amended Complaint”), which named as defendants the former Constant Contact directors and Morgan Stanley & Co. LLC (“Morgan Stanley”), Constant Contact’s financial advisor for the acquisition. The Amended Complaint generally alleged breach of fiduciary duty by the former directors, and aiding and abetting the alleged breach by Morgan Stanley. The Constant Contact defendants filed a motion to dismiss the Amended Complaint on December 15, 2016 and an opening brief in support of the motion to dismiss on March 17, 2017. Plaintiff Myers filed an opposition brief to the motion to dismiss on May 17, 2017, and the Constant Contact defendants’ reply brief was filed on June 19, 2017. Oral argument took place on October 16, 2017 and the court gave the plaintiff 30 days to consider whether to withdraw the case or move forward and receive a decision on the motion to dismiss. On November 2, 2017, the court entered a Stipulation and Order dismissing the case.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans The Company has a defined contribution plan established under Section 401(k) of the Internal Revenue Code (the “401(k) Plan”), which covers substantially all employees. Employees are eligible to participate in the 401(k) Plan beginning on the first day of the month following commencement of their employment. The 401(k) Plan includes a salary deferral arrangement pursuant to which participants may elect to reduce their current compensation by up to the statutorily prescribed limit, equal to $18,000 in 2017 , and have the amount of the reduction contributed to the 401(k) Plan. Beginning January 1, 2013, the Company matched 100% of each participant’s annual contribution to the 401(k) plan up to 3% of the participant’s salary and then 50% of each participant’s contribution up to 2% of each participant’s salary. The match immediately vests 100% . Matching contributions by the Company to the 401(k) Plan related to the 2015 , 2016 and 2017 plan years were approximately $2.5 million , $5.7 million , $6.3 million respectively.

Variable Interest Entity

Variable Interest Entity	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity	Variable Interest Entity The Company, through a subsidiary formed in China, has entered into various agreements with Shanghai Xiao Lan Network Technology Co., Ltd (“Shanghai Xiao Lan”) and its shareholders that allow the Company to effectively control Shanghai Xiao Lan, making it a variable interest entity (“VIE”). Shanghai Xiao Lan has a technology license that allows it to provide local hosting services to customers located in China. Pursuant to contractual arrangements between the shareholders of Shanghai Xiao Lan and the Company, the shareholders of Shanghai Xiao Lan cannot transfer their equity interests without the approval of the Company, and as a result, are considered de facto agents of the Company in accordance with ASC 810-10-25-43. The Company and its de facto agents acting together have the power to direct the activities that most significantly impact the entity’s economic performance and they have the obligation to absorb losses and the right to receive benefits from the entity. In situations where a de facto agency relationship is present, one party is required to be identified as the primary beneficiary. The factors considered include the presence of a principal/agent relationship, the relationship and significance of activities to the reporting entity, the variability associated with the VIE’s anticipated economics and the design of the VIE. The analysis is qualitative in nature and is based on weighting the relative importance on each of the factors in relation to the specifics of the VIE arrangement. Upon the execution of the agreements with Shanghai Xiao Lan and its shareholders, the Company performed an analysis and concluded that the Company is the party that is most closely associated with Shanghai Xiao Lan, as it is the most exposed to the variability of the VIE’s economics and therefore is the primary beneficiary of the VIE. As of December 31, 2017 , the financial position and results of operations of Shanghai Xiao Lan are consolidated within, but are not material to, the Company’s consolidated financial position or results of operations.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has various agreements in place with related parties. Below are details of related party transactions that occurred during the years ended December 31, 2015 , 2016 and 2017 . Tregaron: The Company has contracts with Tregaron India Holdings, LLC and its affiliates, including Diya Systems (Mangalore) Private Limited, Glowtouch Technologies Pvt. Ltd. and Touchweb Designs, LLC, (collectively, “Tregaron”), for outsourced services, including email- and chat-based customer and technical support, network monitoring, engineering and development support, web design and web building services, and an office space lease. These entities are owned directly or indirectly by family members of the Company’s former chief executive officer, who is also a holder of more than 5.0% of the Company's capital stock. The following table includes the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the years ended December 31, 2015 , 2016 and 2017 relating to services provided by Tregaron and its affiliates under these agreements: For the Year Ended December 31, 2015 2016 2017 (in thousands) Cost of revenue $ 10,200 $ 12,200 $ 12,100 Sales and marketing 700 500 1,200 Engineering and development 1,100 1,300 1,300 General and administrative 300 300 200 Total related party transaction expense $ 12,300 $ 14,300 $ 14,800 As of December 31, 2016 , and 2017 , approximately $1.3 million and $1.5 million , respectively, was included in accounts payable and accrued expense relating to services provided by Tregaron. Innovative Business Services, LLC: The Company also has agreements with Innovative Business Services, LLC (“IBS”), which provides multi-layered third-party security applications that are sold by the Company. IBS is majority owned by a director of the Company and by the Company’s former chief executive officer, who is a holder of more than 5.0% of the Company's capital stock. During the year ended December 31, 2017, the Company’s principal agreement with this entity was amended to permit the Company to purchase a specific IBS website performance product at no charge, and in exchange, to increase the revenue share to IBS on certain website performance products. The Company records revenue on the sale of IBS products on a net basis, since the Company views IBS as the primary obligor to deliver these services. As a result, the revenue share paid by the Company to IBS is recorded as contra-revenue. Further, IBS pays the Company a fee on sales made by IBS directly to customers of the Company. The Company records these fees as revenue. The following table includes the revised amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the years ended December 31, 2015 , 2016 and 2017 relating to services provided by IBS under these agreements: For the Year Ended December 31, 2015 2016 2017 (in thousands) Revenue $ (1,300 ) $ (3,100 ) $ (4,250 ) Revenue (contra) 7,000 7,500 7,850 Total related party transaction impact to revenue $ 5,700 $ 4,400 $ 3,600 Cost of revenue 600 700 675 Total related party transaction expense, net $ 6,300 $ 5,100 $ 4,275 As of December 31, 2016 and 2017 , approximately $0.2 million and $0.2 million , respectively, was included in prepaid expenses and other current assets relating to the Company’s agreements with IBS. As of December 31, 2016 and 2017 , approximately 1.1 million and 1.3 million , respectively was included in accounts payable and accrued expense relating to the Company’s agreements with IBS. As of December 31, 2016 and 2017 , approximately $0.6 million and $0.7 million , respectively, was included in accounts receivable relating to the Company’s agreements with IBS. Goldman, Sachs & Co. The Company entered into a three year interest rate cap on December 9, 2015 with a subsidiary of Goldman Sachs & Co. ("Goldman Sachs"). Goldman Sachs is a significant shareholder of the Company. Refer to Note 4: Fair Value Measurements, for further details in the consolidated financial statements. In connection with and concurrently with the acquisition of Constant Contact in February 2016, the Company entered into the $735.0 million incremental first lien term loan facility and the $165.0 million revolving credit facility, and EIG Investors Corp. issued Notes in the aggregate principal amount of $350.0 million . An affiliate of Goldman Sachs provided loans in the aggregate principal amount of $312.4 million under the incremental first lien term loan facility and a commitment in the aggregate principal amount of $57.6 million under the revolving credit facility, and Goldman Sachs acted as a book-running manager in the Company’s offering of the Notes and purchased approximately $148.8 million worth of the Notes. The foregoing financing arrangements were provided in accordance with a commitment letter the Company entered into with an affiliate of Goldman Sachs and certain other investment banks in November 2015. Refer to Note 9: Notes Payable , for further details. Goldman Sachs also served as a financial advisor in connection with the acquisition of Constant Contact and during the year ended December 31, 2016, the Company paid approximately $8.6 million to Goldman Sachs in connection with these services. In connection with the issuance of the Notes, the Company agreed to assist the initial purchasers, including Goldman Sachs, in marketing the Notes. Through December 31, 2016, the Company incurred expenses on behalf of the initial purchasers of approximately $0.8 million . Goldman Sachs Lending Partners LLC, a subsidiary of Goldman, was one of the joint bookrunners and joint lead arrangers for the 2017 Refinancing. In that capacity, Goldman Sachs Lending Partners LLC received an arrangement fee of $0.5 million , and was reimbursed for an immaterial amount of expenses. A subsidiary of Goldman Sachs is also the counterparty to the Company's interest rate cap, for which the Company paid $3.0 million to the counterparty as a premium during the year ended December 31, 2016. No further premiums are payable under this interest rate cap.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise that engage in business activities for which discrete financial information is available and regularly reviewed by the chief operating decision maker. The Company's chief executive officer is the Company's chief operating decision maker. On February 9, 2016, the Company acquired Constant Contact. The Company evaluated the criteria in ASC 280-10-50-11 contemporaneously with its acquisition of Constant Contact, which closed on February 9, 2016. Based on the Company's original evaluation, the Company believed that it met the qualitative aggregation criteria in ASC 280-10-50-11, and that the economic characteristics of the Constant Contact and legacy businesses were similar. In particular, at the time of this evaluation, the Company expected that the gross margin of Constant Contact and its legacy business would be similar. However, beginning with the second quarter of 2016, the Company recognized that the legacy business did not meet expectations and therefore resulted in lower legacy gross margin than originally anticipated, which continued into the third and fourth quarter. As such, during the Company's annual assessment of segments for the year ended December 31, 2016, and due to the resulting 2016 legacy performance, the Company determined it had two reportable segments. The Company has experienced significant changes in its management structure during fiscal year 2017, including a change in its chief executive officer, who is the Company's chief operating decision maker ("CODM"). The Company's leadership structure has been revised to centralize management of certain domain leading brands in order to improve overall performance. As a result of these management changes, management has revised internal financial reporting structures, and broken the former web presence segment into two reportable segments, web presence and domains. The Company's third reportable segment, email marketing, remains unchanged. The products and services included in each of the three reportable segments are as follows: Web Presence . The web presence segment consists primarily of the Company's web hosting brands, such as Bluehost and HostGator, and related products such as domain names, website security, website design tools and services, and e-commerce products. Domain . The domain segment consists of domain-focused brands such as Domain.com, ResellerClub and LogicBoxes as well as certain web hosting brands that are under common management with domain-focused brands. This segment sells domain names and domain management services to resellers and end users, as well as premium domain names, and also generates advertising revenue from domain name parking. It also resells domain names and domain management services to the web presence segment. Email Marketing . The email marketing segment consists of Constant Contact email marketing tools and related products and our SinglePlatform digital storefront solution. The Company measures profitably of these segments based on revenue, gross profit, and adjusted EBITDA. The Company's segments share certain resources, primarily related to sales and marketing, engineering and general and administrative functions. Management allocates these costs to each respective segment based on a consistently applied methodology. The accounting policies of each segment are the same as those described in the summary of significant accounting policies, refer to Note 2: Summary of Significant Accounting Policies , for further details. The following tables contain financial information for each reportable segment for the years ended December 31, 2015, 2016 and 2017, with the 2015 and 2016 results recast to conform with the 2017 presentation: Year ended December 31, 2015 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 596,687 $ — $ 144,628 $ 741,315 Gross profit 267,946 — 48,334 316,280 Net loss (34,049 ) — 8,279 (25,770 ) Plus: Interest expense, net (2) 56,663 — 1,751 58,414 Income tax expense (benefit) 12,756 — (1,414 ) 11,342 Depreciation 31,947 — 2,063 34,010 Amortization of other intangible assets 83,106 — 7,951 91,057 Stock-based compensation 25,513 — 4,412 29,925 Restructuring expenses 1,210 — 279 1,489 Transaction expenses and charges 8,265 — 1,317 9,582 Gain of unconsolidated entities (3) 9,200 — — 9,200 Impairment of other long-lived assets (4) — — — — Adjusted EBITDA $ 194,611 $ — $ 24,638 $ 219,249 Year ended December 31, 2016 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 648,732 $ 326,808 $ 135,602 $ 1,111,142 Gross profit 309,116 173,163 44,872 527,151 Net loss (24,382 ) (55,857 ) (990 ) (81,229 ) Plus: Interest expense, net (2) 68,617 81,469 2,226 $ 152,312 Income tax expense (benefit) (79,632 ) (33,543 ) 3,317 $ (109,858 ) Depreciation 33,590 23,747 3,023 $ 60,360 Amortization of other intangible assets 72,733 64,679 6,150 $ 143,562 Stock-based compensation 41,481 12,403 4,383 $ 58,267 Restructuring expenses 1,625 22,379 220 $ 24,224 Transaction expenses and charges 31,260 984 40 $ 32,284 Gain of unconsolidated entities (3) (565 ) — — $ (565 ) Impairment of other long-lived assets (4) 9,039 — — 9,039 Adjusted EBITDA $ 153,766 $ 116,261 $ 18,369 $ 288,396 Year ended December 31, 2017 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 641,993 $ 401,250 $ 133,624 $ 1,176,867 Gross profit 298,687 254,941 19,309 572,937 Net loss (70,375 ) (10,615 ) (18,794 ) (99,784 ) Plus: Interest expense, net (2) 67,491 86,914 2,001 $ 156,406 Income tax expense (benefit) 2,575 5,152 (25,008 ) (17,281 ) Depreciation 37,634 13,912 3,639 55,185 Amortization of other intangible assets 60,277 74,467 5,610 140,354 Stock-based compensation 46,641 6,934 6,426 60,001 Restructuring expenses 9,131 5,581 1,098 15,810 Transaction expenses and charges — 773 — 773 Gain of unconsolidated entities (3) (110 ) — — (110 ) Impairment of other long-lived assets (4) 600 — 30,860 31,460 SEC investigations reserve 4,323 2,751 926 8,000 Adjusted EBITDA $ 158,187 $ 185,869 $ 6,758 $ 350,814 Total assets $ 1,534,225 $ 903,869 $ 144,615 (1) Revenue excludes intercompany sales of domain sales and domain services from the domain segment to the web presence segment of $4.9 million , $7.6 million and $9.9 million , for fiscal years 2015, 2016 and 2017, respectively. (2) Interest expense includes impact of amortization of deferred financing costs, original issue discounts and interest income. For the year ended December 31, 2017, it also includes $6.5 million of deferred financing costs and OID immediately expensed upon the 2017 Refinancing. (3) The (gain) loss of unconsolidated entities is reported on a net basis for the years ended December 31, 2016 and 2017 . The The year ended December 31, 2016 includes an $11.4 million gain on the Company's investment in WZ UK, Ltd. This gain was generated on January 6, 2016, when the Company increased its ownership stake in WZ UK from 49% to 57.5% , which required a revaluation of its existing investment to its implied fair value. This gain was offset by the following: a loss of $4.8 million on an investment in AppMachine B.V., which was generated on July 27, 2016, when the Company increased its ownership stake in AppMachine from 40% to 100% , which required a revaluation of the existing investment to its implied fair value; a loss of $4.7 million on the impairment of the Company's 33% equity investment in Fortifico Limited; and the Company's proportionate share of net losses from unconsolidated entities of $1.3 million . (4) The impairment of other long lived assets for the year ended December 31, 2016 includes $7.0 million of impairment charges related to developed and in-process technology related to the Webzai acquisition, and $2.0 million of internally developed software that was abandoned. The impairment of other long-lived assets for the year ended December 31, 2017 includes $13.8 million related to certain domain name intangible assets, $0.6 million to write off a debt investment in a privately held entity, $12.1 million related to impairment of goodwill associated with the domain segment, and $4.9 million related to developed technology and customer relationships associated with the Directi acquisition. Geographic and Other Information Revenue, classified by the major geographic areas in which the Company's customers are located, was as follows: Year Ended December 31, 2015 2016 2017 (in thousands) United States $ 465,446 $ 787,915 $ 845,305 International 275,869 323,227 331,562 Total $ 741,315 $ 1,111,142 $ 1,176,867 The following table presents the amount of tangible long-lived assets by geographic area: 2016 2017 (in thousands) United States $ 89,147 $ 89,325 International 6,125 6,127 Total $ 95,272 $ 95,452 The Company’s revenue is generated primarily from products and services delivered on a subscription basis, which include web hosting, domains, website builders, search engine marketing, email marketing and other similar services. The Company also generates non-subscription revenue through domain monetization and marketing development funds. Non-subscription revenue increased from $52.5 million , or 7% of total revenue for the year ended December 31, 2015 to $39.4 million , or 4% of revenue for the year ended December 31, 2016, and remained consistent at $39.4 million , or 3% of total revenue for the year ended December 31, 2017. The majority of the Company's non-subscription revenue is included in its domain segment. No individual international country represented more than 10% of total revenue in any period presented. Furthermore, substantially all of the Company's tangible long-lived assets are located in the United States.

Geographic and Other Informatio

Geographic and Other Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information Operating segments are defined as components of an enterprise that engage in business activities for which discrete financial information is available and regularly reviewed by the chief operating decision maker. The Company's chief executive officer is the Company's chief operating decision maker. On February 9, 2016, the Company acquired Constant Contact. The Company evaluated the criteria in ASC 280-10-50-11 contemporaneously with its acquisition of Constant Contact, which closed on February 9, 2016. Based on the Company's original evaluation, the Company believed that it met the qualitative aggregation criteria in ASC 280-10-50-11, and that the economic characteristics of the Constant Contact and legacy businesses were similar. In particular, at the time of this evaluation, the Company expected that the gross margin of Constant Contact and its legacy business would be similar. However, beginning with the second quarter of 2016, the Company recognized that the legacy business did not meet expectations and therefore resulted in lower legacy gross margin than originally anticipated, which continued into the third and fourth quarter. As such, during the Company's annual assessment of segments for the year ended December 31, 2016, and due to the resulting 2016 legacy performance, the Company determined it had two reportable segments. The Company has experienced significant changes in its management structure during fiscal year 2017, including a change in its chief executive officer, who is the Company's chief operating decision maker ("CODM"). The Company's leadership structure has been revised to centralize management of certain domain leading brands in order to improve overall performance. As a result of these management changes, management has revised internal financial reporting structures, and broken the former web presence segment into two reportable segments, web presence and domains. The Company's third reportable segment, email marketing, remains unchanged. The products and services included in each of the three reportable segments are as follows: Web Presence . The web presence segment consists primarily of the Company's web hosting brands, such as Bluehost and HostGator, and related products such as domain names, website security, website design tools and services, and e-commerce products. Domain . The domain segment consists of domain-focused brands such as Domain.com, ResellerClub and LogicBoxes as well as certain web hosting brands that are under common management with domain-focused brands. This segment sells domain names and domain management services to resellers and end users, as well as premium domain names, and also generates advertising revenue from domain name parking. It also resells domain names and domain management services to the web presence segment. Email Marketing . The email marketing segment consists of Constant Contact email marketing tools and related products and our SinglePlatform digital storefront solution. The Company measures profitably of these segments based on revenue, gross profit, and adjusted EBITDA. The Company's segments share certain resources, primarily related to sales and marketing, engineering and general and administrative functions. Management allocates these costs to each respective segment based on a consistently applied methodology. The accounting policies of each segment are the same as those described in the summary of significant accounting policies, refer to Note 2: Summary of Significant Accounting Policies , for further details. The following tables contain financial information for each reportable segment for the years ended December 31, 2015, 2016 and 2017, with the 2015 and 2016 results recast to conform with the 2017 presentation: Year ended December 31, 2015 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 596,687 $ — $ 144,628 $ 741,315 Gross profit 267,946 — 48,334 316,280 Net loss (34,049 ) — 8,279 (25,770 ) Plus: Interest expense, net (2) 56,663 — 1,751 58,414 Income tax expense (benefit) 12,756 — (1,414 ) 11,342 Depreciation 31,947 — 2,063 34,010 Amortization of other intangible assets 83,106 — 7,951 91,057 Stock-based compensation 25,513 — 4,412 29,925 Restructuring expenses 1,210 — 279 1,489 Transaction expenses and charges 8,265 — 1,317 9,582 Gain of unconsolidated entities (3) 9,200 — — 9,200 Impairment of other long-lived assets (4) — — — — Adjusted EBITDA $ 194,611 $ — $ 24,638 $ 219,249 Year ended December 31, 2016 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 648,732 $ 326,808 $ 135,602 $ 1,111,142 Gross profit 309,116 173,163 44,872 527,151 Net loss (24,382 ) (55,857 ) (990 ) (81,229 ) Plus: Interest expense, net (2) 68,617 81,469 2,226 $ 152,312 Income tax expense (benefit) (79,632 ) (33,543 ) 3,317 $ (109,858 ) Depreciation 33,590 23,747 3,023 $ 60,360 Amortization of other intangible assets 72,733 64,679 6,150 $ 143,562 Stock-based compensation 41,481 12,403 4,383 $ 58,267 Restructuring expenses 1,625 22,379 220 $ 24,224 Transaction expenses and charges 31,260 984 40 $ 32,284 Gain of unconsolidated entities (3) (565 ) — — $ (565 ) Impairment of other long-lived assets (4) 9,039 — — 9,039 Adjusted EBITDA $ 153,766 $ 116,261 $ 18,369 $ 288,396 Year ended December 31, 2017 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 641,993 $ 401,250 $ 133,624 $ 1,176,867 Gross profit 298,687 254,941 19,309 572,937 Net loss (70,375 ) (10,615 ) (18,794 ) (99,784 ) Plus: Interest expense, net (2) 67,491 86,914 2,001 $ 156,406 Income tax expense (benefit) 2,575 5,152 (25,008 ) (17,281 ) Depreciation 37,634 13,912 3,639 55,185 Amortization of other intangible assets 60,277 74,467 5,610 140,354 Stock-based compensation 46,641 6,934 6,426 60,001 Restructuring expenses 9,131 5,581 1,098 15,810 Transaction expenses and charges — 773 — 773 Gain of unconsolidated entities (3) (110 ) — — (110 ) Impairment of other long-lived assets (4) 600 — 30,860 31,460 SEC investigations reserve 4,323 2,751 926 8,000 Adjusted EBITDA $ 158,187 $ 185,869 $ 6,758 $ 350,814 Total assets $ 1,534,225 $ 903,869 $ 144,615 (1) Revenue excludes intercompany sales of domain sales and domain services from the domain segment to the web presence segment of $4.9 million , $7.6 million and $9.9 million , for fiscal years 2015, 2016 and 2017, respectively. (2) Interest expense includes impact of amortization of deferred financing costs, original issue discounts and interest income. For the year ended December 31, 2017, it also includes $6.5 million of deferred financing costs and OID immediately expensed upon the 2017 Refinancing. (3) The (gain) loss of unconsolidated entities is reported on a net basis for the years ended December 31, 2016 and 2017 . The The year ended December 31, 2016 includes an $11.4 million gain on the Company's investment in WZ UK, Ltd. This gain was generated on January 6, 2016, when the Company increased its ownership stake in WZ UK from 49% to 57.5% , which required a revaluation of its existing investment to its implied fair value. This gain was offset by the following: a loss of $4.8 million on an investment in AppMachine B.V., which was generated on July 27, 2016, when the Company increased its ownership stake in AppMachine from 40% to 100% , which required a revaluation of the existing investment to its implied fair value; a loss of $4.7 million on the impairment of the Company's 33% equity investment in Fortifico Limited; and the Company's proportionate share of net losses from unconsolidated entities of $1.3 million . (4) The impairment of other long lived assets for the year ended December 31, 2016 includes $7.0 million of impairment charges related to developed and in-process technology related to the Webzai acquisition, and $2.0 million of internally developed software that was abandoned. The impairment of other long-lived assets for the year ended December 31, 2017 includes $13.8 million related to certain domain name intangible assets, $0.6 million to write off a debt investment in a privately held entity, $12.1 million related to impairment of goodwill associated with the domain segment, and $4.9 million related to developed technology and customer relationships associated with the Directi acquisition. Geographic and Other Information Revenue, classified by the major geographic areas in which the Company's customers are located, was as follows: Year Ended December 31, 2015 2016 2017 (in thousands) United States $ 465,446 $ 787,915 $ 845,305 International 275,869 323,227 331,562 Total $ 741,315 $ 1,111,142 $ 1,176,867 The following table presents the amount of tangible long-lived assets by geographic area: 2016 2017 (in thousands) United States $ 89,147 $ 89,325 International 6,125 6,127 Total $ 95,272 $ 95,452 The Company’s revenue is generated primarily from products and services delivered on a subscription basis, which include web hosting, domains, website builders, search engine marketing, email marketing and other similar services. The Company also generates non-subscription revenue through domain monetization and marketing development funds. Non-subscription revenue increased from $52.5 million , or 7% of total revenue for the year ended December 31, 2015 to $39.4 million , or 4% of revenue for the year ended December 31, 2016, and remained consistent at $39.4 million , or 3% of total revenue for the year ended December 31, 2017. The majority of the Company's non-subscription revenue is included in its domain segment. No individual international country represented more than 10% of total revenue in any period presented. Furthermore, substantially all of the Company's tangible long-lived assets are located in the United States.

Quarterly Financial Data (unaud

Quarterly Financial Data (unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (unaudited)	Quarterly Financial Data (unaudited) The following table presents the Company’s unaudited quarterly financial data: For the three months ended March 31, June 30, Sept. 30, Dec. 31, March 31, June 30, Sept. 30, Dec. 31, (in thousands, except per share data) Revenue $ 237,113 $ 290,713 $ 291,193 $ 292,123 $ 295,137 $ 292,258 $ 295,222 $ 294,250 Gross profit 100,637 137,636 141,766 147,112 146,388 145,675 136,357 144,517 Income (loss) from operations (66,311 ) (6,168 ) 8,879 24,260 13,594 12,647 (1,070 ) 14,660 Net income (loss) attributable to Endurance International Group Holdings, Inc. $ 21,811 $ (28,040 ) $ (31,737 ) $ (34,865 ) $ (35,388 ) $ (39,129 ) $ (40,264 ) $ 7,473 Basic net income (loss) per share attributable to Endurance International Group Holdings, Inc. $ 0.17 $ (0.21 ) $ (0.24 ) $ (0.26 ) $ (0.26 ) $ (0.29 ) $ (0.29 ) $ 0.05 Diluted net income (loss) per share attributable to Endurance International Group Holdings, Inc. $ 0.16 $ (0.21 ) $ (0.24 ) $ (0.26 ) $ (0.26 ) $ (0.29 ) $ (0.29 ) $ 0.05 On February 9, 2016, the Company acquired Constant Contact for $1.1 billion . As such, financial results reflected above were materially impacted by this acquisition. Revenue and gross profit increases throughout 2016 and 2017 are primarily driven by this acquisition. The loss from operations has also been impacted by the Constant Contact acquisition due to the $31.1 million of transaction costs incurred in the first quarter of 2016, and higher operating expenses from Constant Contact, including $22.4 million of restructuring costs incurred throughout 2016, of which, $11.6 million was incurred during the first quarter. Net income (loss) was impacted by all of the factors previously noted, and a $94.1 million increase in interest expense for all of 2016 as well as a $109.9 million tax benefit recorded during 2016. The tax benefit was primarily related to the reduction of valuation allowances on deferred tax assets which occurred during the first quarter of 2016, partially offset by increased valuation allowances of $10.0 million during the fourth quarter of 2016. For the year ended December 31, 2017, the Company recorded a tax benefit of $17.3 million , which was primarily related to a federal and state deferred tax benefit of $21.8 million (which includes $16.9 million tax benefit pertaining to the federal tax rate change as a result of the Tax Cuts and Jobs Act of 2017 and the identification and recognition of $2.2 million of U.S. federal and state tax credits) and to a foreign deferred tax benefit of $1.0 million , partially offset by a provision for federal and state current income taxes of $1.8 million , a reserve of $1.1 million for unrecognized tax benefits, and foreign current tax expense of $2.6 million .

Supplemental Guarantor Financia

Supplemental Guarantor Financial Information (Notes)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Supplemental Guarantor Financial Information	Supplemental Guarantor Financial Information In February 2016, EIG Investors Corp., a wholly-owned subsidiary of the Company (the “Issuer”), issued $350.0 million aggregate principal amount of its 10.875% Senior Notes due 2024 (the “Original Notes”) (refer to Note 9: Notes Payables, in the consolidated financial statements), which it exchanged for new 10.875% Senior Notes due 2024 (the “Exchange Notes” and together with the Original Notes, collectively, the “Notes”) pursuant to a registration statement on Form S-4. The registered exchange offer for the Notes was completed on January 30, 2017. The Notes are fully and unconditionally guaranteed, jointly and severally, on a senior unsecured basis by the Company, and the following wholly-owned subsidiaries: The Endurance International Group, Inc., Bluehost Inc., FastDomain Inc., Domain Name Holding Company, Inc., Endurance International Group – West, Inc., HostGator.com LLC, A Small Orange, LLC, Constant Contact, Inc., and SinglePlatform, LLC, (collectively, the “Subsidiary Guarantors”), subject to certain customary guarantor release conditions. The Company’s other domestic subsidiaries and its foreign subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) have not guaranteed the Notes. The Company sold two immaterial guarantors, CardStar, Inc. and CardStar Publishing, LLC (collectively, "CardStar"), during the quarter ended December 31, 2016. CardStar was released and discharged from the guarantee as a result of the sale and no longer guarantees the debt of the Company as of December 1, 2016. Proceeds from the sale of CardStar were approximately $0.1 million . The following tables present supplemental condensed consolidating balance sheet information of the Company (“Parent”), the Issuer, the Subsidiary Guarantors and the Non-Guarantor Subsidiaries as of December 31, 2016 and December 31, 2017, and supplemental condensed consolidating results of operations and cash flow information for the years ended December 31, 2015, 2016 and 2017: Condensed Consolidating Balance Sheets December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 3 $ 4 $ 39,034 $ 14,555 — $ 53,596 Restricted cash — — 2,620 682 — 3,302 Accounts receivable — — 10,148 2,940 — 13,088 Prepaid domain name registry fees — — 31,044 24,697 (297 ) 55,444 Prepaid expenses & other current assets — 81 17,996 10,601 — 28,678 Total current assets 3 85 100,842 53,475 (297 ) 154,108 Intercompany receivables, net 31,665 799,953 (690,761 ) (140,857 ) — — Property and equipment, net — — 82,901 12,371 — 95,272 Goodwill — — 1,683,121 176,788 — 1,859,909 Other intangible assets, net — — 592,095 19,962 — 612,057 Investment in subsidiaries 92,068 1,299,562 40,651 — (1,432,281 ) — Other assets — 5,911 23,153 5,864 — 34,928 Total assets $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Liabilities, redeemable non-controlling interest and stockholders' equity Current liabilities: Accounts payable $ — $ — $ 13,801 $ 2,273 — $ 16,074 Accrued expenses and other current liabilities — 27,208 60,760 9,890 — 97,858 Deferred revenue — — 295,208 60,925 (943 ) 355,190 Current portion of notes payable — 35,700 — — — 35,700 Current portion of capital lease obligations — — 6,690 — — 6,690 Deferred consideration, short-term — — 4,415 858 — 5,273 Total current liabilities — 62,908 380,874 73,946 (943 ) 516,785 Deferred revenue, long-term — — 77,649 11,551 — 89,200 Notes payable — 1,951,280 — — — 1,951,280 Capital lease obligations — — 512 — — 512 Deferred consideration — — 7,419 25 — 7,444 Other long-term liabilities — (745 ) 48,233 1,429 — 48,917 Total liabilities — 2,013,443 514,687 86,951 (943 ) 2,614,138 Redeemable non-controlling interest — — 17,753 — — 17,753 Equity 123,736 92,068 1,299,562 40,652 (1,431,635 ) 124,383 Total liabilities and equity $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Condensed Consolidating Balance Sheets December 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 92 $ 2 $ 54,473 $ 11,926 $ — $ 66,493 Restricted cash — — 2,472 153 — 2,625 Accounts receivable — — 12,386 3,559 — 15,945 Prepaid domain name registry fees — — 28,291 25,514 — 53,805 Prepaid expenses & other current assets (12 ) 86 20,062 9,191 — 29,327 Total current assets 80 88 117,684 50,343 — 168,195 Intercompany receivables, net 33,637 606,834 (498,213 ) (142,258 ) — — Property and equipment, net — — 81,693 13,759 — 95,452 Goodwill — — 1,673,851 176,731 — 1,850,582 Other intangible assets, net — — 450,778 4,662 — 455,440 Investment in subsidiaries 49,288 1,355,013 37,200 — (1,441,501 ) — Other assets — 3,639 21,373 6,405 — 31,417 Total assets $ 83,005 $ 1,965,574 $ 1,884,366 $ 109,642 $ (1,441,501 ) $ 2,601,086 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 9,532 $ 1,526 $ — $ 11,058 Accrued expenses and other current liabilities — 24,509 75,819 8,151 — 108,479 Deferred revenue — — 309,395 52,545 — 361,940 Current portion of notes payable — 33,945 — — — 33,945 Current portion of capital lease obligations — — 7,630 — — 7,630 Deferred consideration, short-term — — 4,365 — — 4,365 Total current liabilities — 58,454 406,741 62,222 — 527,417 Deferred revenue, long-term — — 81,199 9,773 — 90,972 Notes payable — 1,858,300 — — — 1,858,300 Capital lease obligations — — 7,719 — — 7,719 Deferred consideration — — 3,551 — — 3,551 Other long-term liabilities — (468 ) 30,143 447 — 30,122 Total liabilities — 1,916,286 529,353 72,442 — 2,518,081 Equity 83,005 49,288 1,355,013 37,200 (1,441,501 ) 83,005 Total liabilities and equity $ 83,005 $ 1,965,574 $ 1,884,366 $ 109,642 $ (1,441,501 ) $ 2,601,086 Condensed Consolidating Statements of Operations and Comprehensive Loss Year Ended December 31, 2015 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 628,266 $ 113,766 $ (717 ) $ 741,315 Cost of revenue — — 349,059 77,177 (1,201 ) 425,035 Gross profit — — 279,207 36,589 484 316,280 Operating expense: Sales & marketing — — 120,637 24,815 (33 ) 145,419 Engineering and development — — 23,019 3,688 — 26,707 General and administrative — 177 80,548 10,132 111 90,968 Total operating expense — 177 224,204 38,635 78 263,094 Income (loss) from operations — (177 ) 55,003 (2,046 ) 406 53,186 Interest expense and other income, net — 56,843 (3,554 ) (315 ) — 52,974 Income (loss) before income taxes and equity earnings of unconsolidated entities — (57,020 ) 58,557 (1,731 ) 406 212 Income tax expense (benefit) — 10,320 331 691 — 11,342 Income (loss) before equity earnings of unconsolidated entities — (67,340 ) 58,226 (2,422 ) 406 (11,130 ) Equity (income) loss of unconsolidated entities, net of tax 26,176 (41,164 ) 17,063 — 12,565 14,640 Net income (loss) (26,176 ) (26,176 ) 41,163 (2,422 ) (12,159 ) (25,770 ) Net loss attributable to non-controlling interest — — — — — — Net income (loss) attributable to Endurance $ (26,176 ) $ (26,176 ) $ 41,163 $ (2,422 ) $ (12,159 ) $ (25,770 ) Comprehensive income (loss): Foreign currency translation adjustments — — — (1,281 ) — (1,281 ) Unrealized gain on cash flow hedge — 80 — — — 80 Total comprehensive income (loss) $ (26,176 ) $ (26,096 ) $ 41,163 $ (3,703 ) $ (12,159 ) $ (26,971 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Year Ended December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 978,690 $ 133,274 $ (822 ) 1,111,142 Cost of revenue — — 496,267 88,753 (1,029 ) 583,991 Gross profit — — 482,423 44,521 207 527,151 Operating expense: Sales and marketing — — 235,988 67,556 (33 ) 303,511 Engineering and development — — 72,922 14,679 — 87,601 General and administrative — 242 128,337 14,516 — 143,095 Transaction expenses — — 32,284 — — 32,284 Total operating expense — 242 469,531 96,751 (33 ) 566,491 Income (loss) from operations — (242 ) 12,892 (52,230 ) 240 (39,340 ) Interest expense and other income —net — 149,512 (3,606 ) 4,544 — 150,450 Income (loss) before income taxes and equity earnings of unconsolidated entities — (149,754 ) 16,498 (56,774 ) 240 (189,790 ) Income tax expense (benefit) — (53,847 ) (55,953 ) (58 ) — (109,858 ) Income (loss) before equity earnings of unconsolidated entities — (95,907 ) 72,451 (56,716 ) 240 (79,932 ) Equity (income) loss of unconsolidated entities, net of tax 73,071 (22,837 ) 58,014 297 (107,248 ) 1,297 Net income (loss) $ (73,071 ) $ (73,070 ) $ 14,437 $ (57,013 ) $ 107,488 $ (81,229 ) Net income (loss) attributable to non-controlling interest — — (8,398 ) — — (8,398 ) Net income (loss) attributable to Endurance International Group Holdings, Inc. (73,071 ) (73,070 ) 22,835 (57,013 ) 107,488 (72,831 ) Comprehensive income (loss): Foreign currency translation adjustments — — — (597 ) — (597 ) Unrealized loss on cash flow hedge (1,351 ) — — — (1,351 ) Total comprehensive income (loss) $ (73,071 ) $ (74,421 ) $ 22,835 $ (57,610 ) $ 107,488 $ (74,779 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Year Ended December 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 1,055,013 $ 128,350 $ (6,496 ) $ 1,176,867 Cost of revenue — — 515,065 94,082 (5,217 ) 603,930 Gross profit — — 539,948 34,268 (1,279 ) 572,937 Operating expense: Sales and marketing — — 256,902 20,561 (3 ) 277,460 Engineering and development — — 66,051 12,721 — 78,772 General and administrative — 207 155,339 9,054 (628 ) 163,972 Transaction expenses — — 773 — — 773 Impairment of goodwill 12,129 12,129 Total operating expense — 207 491,194 42,336 (631 ) 533,106 Income (loss) from operations — (207 ) 48,754 (8,068 ) (648 ) 39,831 Interest expense and other income —net — 156,144 1,338 (476 ) — 157,006 Income (loss) before income taxes and equity earnings of unconsolidated entities — (156,351 ) 47,416 (7,592 ) (648 ) (117,175 ) Income tax expense (benefit) — (57,504 ) 39,125 1,098 — (17,281 ) Income (loss) before equity earnings of unconsolidated entities — (98,847 ) 8,291 (8,690 ) (648 ) (99,894 ) Equity (income) loss of unconsolidated entities, net of tax 99,137 290 8,581 (17 ) (108,101 ) (110 ) Net income (loss) $ (99,137 ) $ (99,137 ) $ (290 ) $ (8,673 ) $ 107,453 $ (99,784 ) Net loss attributable to non-controlling interest — — 7,524 — — 7,524 Net income (loss) attributable to Endurance International Group Holdings, Inc. (99,137 ) (99,137 ) (7,814 ) (8,673 ) 107,453 (107,308 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 3,091 — 3,091 Unrealized gain (loss) on cash flow hedge 34 — — — 34 Total comprehensive income (loss) $ (99,137 ) $ (99,103 ) $ (7,814 ) $ (5,582 ) $ 107,453 $ (104,183 ) Condensed Consolidating Statements of Cash Flows Year Ended December 31, 2015 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ 2 $ (50,147 ) $ 220,468 6,905 — $ 177,228 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (92,376 ) (5,419 ) — (97,795 ) Purchases of property and equipment — — (28,058 ) (3,185 ) — (31,243 ) Cash paid for minority investments — — (8,475 ) — — (8,475 ) Proceeds from sale of property and equipment — — 51 42 — 93 Proceeds from note receivable — — 3,454 — — 3,454 Proceeds from sale of assets — — 191 — — 191 Purchases of intangible assets — — (76 ) — — (76 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — (296 ) 346 — 50 Net cash used in investing activities — — (125,585 ) (8,216 ) — (133,801 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 147,000 — — — 147,000 Repayment of notes payable and revolver — (140,500 ) — — — (140,500 ) Payment of financing costs — — — — — — Payment of deferred consideration — — (14,503 ) (488 ) — (14,991 ) Payment of redeemable non-controlling interest liability — — (30,543 ) — — (30,543 ) Principal payments on capital lease obligations — — (4,822 ) — — (4,822 ) Proceeds from exercise of stock options 2,224 — — — — 2,224 Intercompany loans and investments (2,215 ) 39,367 (42,431 ) 5,279 — — Net cash provided by (used in) financing activities 9 45,867 (92,299 ) 4,791 — (41,632 ) Net effect of exchange rate on cash and cash equivalents — — — (1,144 ) — (1,144 ) Net increase (decrease) in cash and cash equivalents 11 (4,280 ) 2,584 2,336 — 651 Cash and cash equivalents: Beginning of period 1 4,347 18,702 9,329 — 32,379 End of period $ 12 $ 67 $ 21,286 $ 11,665 $ — $ 33,030 Condensed Consolidating Statements of Cash Flows Year Ended December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ (71,204 ) $ 256,461 (30,296 ) $ 154,961 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (889,634 ) — — (889,634 ) Purchases of property and equipment — — (32,528 ) (4,731 ) — (37,259 ) Cash paid for minority investments — — (5,600 ) — — (5,600 ) Proceeds from sale of property and equipment — — 674 2 — 676 Purchases of intangible assets — — (7 ) (20 ) — (27 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — (347 ) (210 ) — (557 ) Net cash used in investing activities — — (927,442 ) (4,959 ) — (932,401 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 1,110,678 — — — 1,110,678 Repayment of notes payable and revolver — (176,700 ) — — — (176,700 ) Payment of financing costs — (52,561 ) — — — (52,561 ) Payment of deferred consideration — — (50,375 ) (669 ) — (51,044 ) Payment of redeemable non-controlling interest liability — — (33,425 ) — — (33,425 ) Principal payments on capital lease obligations — — (5,892 ) — — (5,892 ) Proceeds from exercise of stock options 2,564 — — — — 2,564 Capital investments from minority partner — — — 2,776 — 2,776 Intercompany loans and investments (2,573 ) (810,276 ) 778,421 34,428 — — Net cash provided by (used in) financing activities (9 ) 71,141 688,729 36,535 — 796,396 Net effect of exchange rate on cash and cash equivalents — — — 1,610 — 1,610 Net increase (decrease) in cash and cash equivalents (9 ) (63 ) 17,748 2,890 — 20,566 Cash and cash equivalents: Beginning of period 12 67 21,286 11,665 33,030 End of period $ 3 $ 4 $ 39,034 $ 14,555 $ — $ 53,596 Condensed Consolidating Statements of Cash Flows Year Ended December 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ 12 $ (82,189 ) $ 284,912 (1,462 ) $ 201,273 Cash flows from investing activities: — — — — — Purchases of property and equipment — — (38,731 ) (4,331 ) — (43,062 ) Cash paid for minority investments — — — — — — Proceeds from sale of assets — — 530 — — 530 Purchases of intangible assets — — (1,932 ) (34 ) — (1,966 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — 148 529 — 677 Net cash used in investing activities — — (39,985 ) (3,836 ) — (43,821 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 1,693,007 — — — 1,693,007 Repayment of notes payable and revolver — (1,797,634 ) — — — (1,797,634 ) Payment of financing costs — (6,304 ) — — — (6,304 ) Payment of deferred consideration — — (4,550 ) (883 ) — (5,433 ) Payment of redeemable non-controlling interest liability — — (25,000 ) — — (25,000 ) Principal payments on capital lease obligations — — (7,390 ) — — (7,390 ) Proceeds from exercise of stock options 2,049 — — — — 2,049 Capital investments from minority partner — — — — — — Intercompany loans and investments (1,972 ) 193,118 (192,548 ) 1,402 — — Net cash provided by (used in) financing activities 77 82,187 (229,488 ) 519 — (146,705 ) Net effect of exchange rate on cash and cash equivalents — — — 2,150 — 2,150 Net increase (decrease) in cash and cash equivalents 89 (2 ) 15,439 (2,629 ) — 12,897 Cash and cash equivalents: Beginning of period 3 4 39,034 14,555 53,596 End of period $ 92 $ 2 $ 54,473 $ 11,926 $ — $ 66,493

Summary of Significant Accoun31

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Preparation	Basis of Preparation The accompanying consolidated financial statements, which include the accounts of the Company and its subsidiaries, have been prepared using accounting principles generally accepted in the United States of America (“U.S. GAAP”). All intercompany transactions have been eliminated on consolidation.
Segment Information	Segment Information From the fourth quarter of fiscal year 2016, through the third quarter of fiscal year 2017, the Company had two reportable segments, web presence and email marketing. The Company has experienced significant changes in its management structure during fiscal year 2017, including a change in its chief executive officer, who is the Company's chief operating decision maker ("CODM"). The Company's leadership structure has been revised to centralize management of certain domain-leading brands in order to improve overall performance. As a result of these management changes, management has revised internal financial reporting structures, and broken the former web presence segment into two reportable segments, web presence and domains. The Company's third reportable segment, email marketing, remains unchanged. The products and services included in each of the three reportable segments are as follows: Web Presence . The web presence segment consists primarily of the Company's web hosting brands, such as Bluehost and HostGator, and related products such as domain names, website security, website design tools and services, and e-commerce products. Domain . The domain segment consists of domain-focused brands such as Domain.com, ResellerClub and LogicBoxes as well as certain web hosting brands that are under common management with domain-focused brands. This segment sells domain names and domain management services to resellers and end users, as well as premium domain names, and also generates advertising revenue from domain name parking. It also resells domain names and domain management services to the web presence segment. Email Marketing . The email marketing segment consists of Constant Contact email marketing tools and related products and the SinglePlatform digital storefront solution. The Company's segments share certain resources, primarily related to sales and marketing, engineering and general and administrative functions. Management allocates these costs to each respective segment based on a consistently applied methodology.
Use of Estimates	Use of Estimates U.S. GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets, liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates, judgments and assumptions used in preparing the accompanying consolidated financial statements are based on the relevant facts and circumstances as of the date of the consolidated financial statements. Although the Company regularly assesses these estimates, judgments and assumptions used in preparing the consolidated financial statements, actual results could differ from those estimates. Changes in estimates are recorded in the period in which they become known. The more significant estimates reflected in these consolidated financial statements include estimates of fair value of assets acquired and liabilities assumed under purchase accounting related to the Company’s acquisitions and when evaluating goodwill and long-lived assets for potential impairment, the estimated useful lives of intangible and depreciable assets, revenue recognition for multiple-element arrangements, stock-based compensation, contingent consideration, derivative instruments, certain accruals, reserves and deferred taxes.
Cash Equivalents	Cash Equivalents Cash and cash equivalents include all highly liquid investments with remaining maturities of three months or less at the date of purchase.
Restricted Cash	Restricted Cash Restricted cash is composed of certificates of deposits and cash held by merchant banks and payment processors, which provide collateral against any chargebacks, fees, or other items that may be charged back to the Company by credit card companies and other merchants, and collateral for certain facility leases.
Accounts Receivable	Accounts Receivable Accounts receivable is primarily composed of cash due from credit card companies for unsettled transactions charged to subscribers’ credit cards. As these amounts reflect authenticated transactions that are fully collectible, the Company does not maintain an allowance for doubtful accounts. The Company also accrues for earned referral fees and commissions, which are governed by reseller or affiliate agreements, when the amount is reasonably estimable.
Prepaid Domain Name Registry Fees	Prepaid Domain Name Registry Fees Prepaid domain name registry fees represent amounts that are paid in full at the time a domain is registered by one of the Company’s registrars on behalf of a customer. The registry fees are recognized on a straight-line basis over the term of the domain registration period.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amounts of the Company’s financial instruments, which include cash equivalents, accounts receivable, accounts payable and certain accrued expenses, approximate their fair values due to their short maturities. The carrying amount of the Company’s contingent consideration is recorded at fair value. The fair value of the Company’s notes payable is based on the borrowing rates currently available to the Company for debt with similar terms and average maturities and approximates their carrying value.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities FASB ASC 815, Derivatives and Hedging (“ASC 815”), provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the Company’s objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. As required by ASC 815, the Company records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk, even though hedge accounting does not apply or the Company elects not to apply hedge accounting. In accordance with the FASB’s fair value measurement guidance in ASU 2011-4, Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio.
Concentrations of Credit and Other Risks	Concentrations of Credit and Other Risks Financial instruments which potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. Cash and cash equivalents are maintained at accredited financial institutions, and PayPal balances are at times without and in excess of federally insured limits. The Company has never experienced any losses related to these balances and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships.
Property and Equipment	Property and Equipment Property and equipment is recorded at cost or fair value if acquired in an acquisition. The Company also capitalizes the direct costs of constructing additional computer equipment for internal use, as well as upgrades to existing computer equipment which extend the useful life, capacity or operating efficiency of the equipment. Capitalized costs include the cost of materials, shipping and taxes. Materials used for repairs and maintenance of computer equipment are expensed and recorded as a cost of revenue. Materials on hand and construction-in-process are recorded as property and equipment. Assets recorded under capital lease are depreciated over the lease term. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease
Software Development Costs	Software Development Costs The Company accounts for software development costs for internal use software under the provisions of ASC 350-40, “Internal-Use Software” . Accordingly, certain costs to develop internal-use computer software are capitalized, provided these costs are expected to be recoverable.
Investments	Investments The Company has minority investments in several privately-held companies. Investments in privately-held companies, in which the Company has a voting interest between 20.0% and 50.0% and exercises significant influence, are accounted for using the equity method of accounting. Under this method, the investment balance, originally recorded at cost, is adjusted to recognize the Company’s share of net earnings or losses of the investee company as they occur, limited to the extent of the Company’s investment in, advances to and commitments for the investee. The Company’s share of net earnings or losses of the investee are reflected in equity losses of unconsolidated entities, net of tax, in the Company’s accompanying consolidated statements of operations. Investments in which the Company has a voting interest of less than 20.0% and over which it does not have significant influence are accounted for under the cost method of accounting.
Business Combinations	Business Combinations The Company accounts for business acquisitions using the purchase method of accounting, in accordance with which assets acquired and liabilities assumed are recorded at their respective fair values at the acquisition date. The fair value of the consideration paid, including contingent consideration, is assigned to the assets acquired and liabilities assumed based on their respective fair values. Goodwill represents excess of the purchase price over the estimated fair values of the assets acquired and liabilities assumed. Significant judgments are used in determining fair values of assets acquired and liabilities assumed, as well as intangibles and their estimated useful lives. Fair value and useful life determinations are based on, among other factors, estimates of future expected cash flows, royalty cost savings and appropriate discount rates used in computing present values. These judgments may materially impact the estimates used in allocating acquisition date fair values to assets acquired and liabilities assumed, as well as the Company's current and future operating results. Actual results may vary from these estimates which may result in adjustments to goodwill and acquisition date fair values of assets and liabilities during a measurement period or upon a final determination of asset and liability fair values, whichever occurs first. Adjustments to fair values of assets and liabilities made after the end of the measurement period are recorded within the Company's operating results. Changes in the fair value of a contingent consideration resulting from a change in the underlying inputs are recognized in results of operations until the arrangement is settled.
Goodwill	Goodwill Goodwill relates to amounts that arose in connection with various acquisitions and represents the difference between the purchase price and the fair value of the identifiable intangible and tangible net assets when accounted for using the purchase method of accounting. Goodwill is not amortized, but is subject to periodic review for impairment. Events that would indicate impairment and trigger an interim impairment assessment include, but are not limited to, current economic and market conditions, a decline in the equity value of the business, a significant adverse change in certain agreements that would materially affect reported operating results, business climate or operational performance of the business and an adverse action or assessment by a regulator. In accordance with Accounting Standards Update No. 2011-08, or ASU 2011-08, Intangibles-Goodwill and Other (Topic 350) Testing Goodwill for Impairment , the Company is required to review goodwill by reporting unit for impairment at least annually or more often if there are indicators of impairment present. A reporting unit is either the equivalent of, or one level below, an operating segment. During 2016, the Company determined that it had two reporting units. The Company has historically performed its annual goodwill test as of December 31st of each fiscal year. The goodwill impairment test for the Company’s two reporting units as of December 31, 2016 followed a two-step process. In the first step, the Company compared the fair value of each reporting unit to its respective carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that reporting unit, goodwill is considered not impaired and no further testing is required. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then a second step is performed to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then an impairment loss equal to the difference is recorded. As of December 31, 2016, the fair value of both of reporting units exceeded their carrying values and, therefore, no impairment existed as of that date. As a result of changes in the Company’s management structure during fiscal year 2017, including the change in its chief executive officer / CODM, the Company has revised its internal financial reporting structure, which has resulted in a change to its reporting units. The Company has identified a total of ten reporting units under the new structure. With the increase in reporting units, the Company determined that more time would be required to perform future goodwill impairment tests, and as a result, decided to accelerate its annual goodwill impairment test date to October 31st of each fiscal year, starting with the fiscal year 2017 test. Before testing goodwill at October 31, 2017, the Company allocated assets and liabilities to their respective reporting units. Goodwill was allocated to each reporting unit in accordance with ASC 350-20-40, which requires that goodwill be allocated based on the relative fair values of each reporting unit. After completing this valuation process, the Company allocated goodwill to seven reporting units. The Company did not allocate any goodwill to three smaller reporting units that were determined to have no material fair value. The carrying value of each reporting unit is based on the assignment of the appropriate assets and liabilities to each reporting unit. Assets and liabilities were assigned to each reporting unit if the assets or liabilities are employed in the operations of the reporting unit and the asset and liability is considered in the determination of the reporting unit fair value. Certain assets and liabilities are shared by multiple reporting units, and were allocated to each reporting unit based on the relative size of a reporting unit, primarily based on revenue. The fair value of each reporting unit is determined by the income approach. The Company also compared the fair value from the income approach to a market based approach to validate that the value derived from the income approach was reasonable. For the income approach, fair value is determined based on the present value of estimated future after-tax cash flows, discounted at an appropriate risk adjusted rate. The Company uses internal forecasts to estimate future after-tax cash flows, which includes an estimate of long-term future growth rates based on the long-term outlook for each reporting unit. Actual results may differ from those assumed in each forecast. The Company derives discount rates using a capital asset pricing model and analyzing published rates for industries relevant to the reporting units to estimate the weighted average cost of capital. The Company uses discount rates that are commensurate with the risks and uncertainty inherent in the business and in internally developed forecasts. For fiscal year 2017, the Company used a discount rate of 10.0% , and also performed sensitivity analysis on the discount rates. For the market approach validation, values were derived based on valuation multiples from sales of comparable companies. The Company has also early adopted the provisions of ASU 2017-4, which eliminates the second step of the goodwill impairment test. As a result, the goodwill impairment test as of October 31, 2017 includes only one step, which is a comparison of the carrying value of each reporting unit to its fair value, and any excess carrying value, up to the amount of goodwill allocated to that reporting unit, is impaired. The goodwill impairment test as of October 31, 2017 resulted in a $12.1 impairment of goodwill to the Company's domain monetization reporting unit within the domain segment. The impairment is a direct result of a more rapid decline in domain parking revenue than originally expected, and to a lesser extent, reduced sales of premium domain names. Goodwill for this reporting unit has been completely impaired. Goodwill allocated to the other six reporting units was not impaired. Goodwill as of December 31, 2017 is $1,850.6 million . Approximately $1,820.7 million of this goodwill relates to reporting units where fair value exceeds each reporting units carrying value by at least 20% . One reporting unit, the domain.com reporting unit within the domain segment, has a goodwill balance of $29.9 million , and a fair value fair value that exceeds its carrying value by 6% . The Company has one reporting unit, the backup reporting unit that is within the web presence segment, that has a negative carrying value and has been allocated $2.3 million of goodwill.
Long-Lived Assets	Long-Lived Assets The Company’s long-lived assets consist primarily of intangible assets, including acquired subscriber relationships, trade names, intellectual property, developed technology, domain names available for sale and in-process research and development (“IPR&D”). The Company also has long-lived tangible assets, primarily consisting of property and equipment. The majority of the Company’s intangible assets are recorded in connection with its various acquisitions. The Company’s intangible assets are recorded at fair value at the time of their acquisition. The Company amortizes intangible assets over their estimated useful lives. Determination of the estimated useful lives of the individual categories of intangible assets is based on the nature of the applicable intangible asset and the expected future cash flows to be derived from the intangible asset. Amortization of intangible assets with finite lives is recognized in accordance with their estimated projected cash flows. The Company evaluates long-lived intangible and tangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If indicators of impairment are present and undiscounted future cash flows are less than the carrying amount, the fair value of the assets is determined and compared to the carrying value. If the fair value is less than the carrying value, then the carrying value of the asset is reduced to the estimated fair value and an impairment loss is charged to expense in the period the impairment is identified. During the year ended December 31, 2016, the Company determined that a portion of an internally developed software tool would not meet its needs following the acquisition of Constant Contact, resulting in an impairment charge of $2.0 million which was recorded in engineering and development expense in the consolidated statements of operations and comprehensive loss. Additionally, the Company recognized an impairment charge of $0.5 million relating to internally developed software relating to Webzai Ltd. (“Webzai”), and another impairment charge of $4.4 million relating to developed technology acquired in the Webzai acquisition, for a total impairment charge of $4.9 million , which was recorded in engineering and development expense in the consolidated statements of operations and comprehensive loss. Refer to Note 6: Property and Equipment and Capital Lease Obligations and Note 7: Goodwill and Other Intangible Assets for further details. Also during the year ended December 31, 2016, the Company incurred total impairment charges of IPR&D of $2.2 million , consisting of $1.4 million to impair certain acquired IPR&D projects from the Webzai acquisition that were abandoned during the year ended December 31, 2016 and a charge of $0.8 million to impair certain acquired IPR&D projects from the AppMachine acquisition. Refer to Note 7: Goodwill and Other Intangible Assets , and Acquired In- Process Research and Development (IPR&D) below for further details. All of the 2016 impairments described above were recognized in the web presence segment. During the year ended December 31, 2017, the Company recognized an impairment charge of $13.8 million relating to certain domain name intangible assets acquired in 2014, which was recorded in cost of revenue in the consolidated statements of operations and comprehensive loss. The impairment resulted from diminished cash flows associated with these intangible assets. Also during the year ended December 31, 2017, the Company recognized an impairment charge of $4.9 million primarily relating to developed technology and customer relationships associated with the acquisition the Directi web presence business in 2014. This impairment was recorded in cost of revenue in the consolidated statements of operations and comprehensive loss. The impairment resulted from diminished cash flows associated with these intangible assets. All of the 2017 impairments described above were recognized in the domains segment. Indefinite life intangible assets include domain names that are available for sale which are recorded at cost to acquire. These assets are not being amortized and are being tested for impairment annually and whenever events or changes in circumstance indicate that their carrying value may not be recoverable. When a domain name is sold, the Company records the cost of the domain in cost of revenue.
Acquired In-Process Research and Development (IPR&D)	Acquired In-Process Research and Development (IPR&D) Acquired IPR&D represents the fair value assigned to research and development assets that the Company acquires that have not been completed at the date of acquisition. The acquired IPR&D is capitalized as an intangible asset and reviewed on a quarterly basis to determine future use. Any impairment loss of the acquired IPR&D is charged to expense in the period the impairment is identified. Upon commercialization, the acquired fair value of the IPR&D will be reclassified to developed technology and amortized over its estimated useful life.
Revenue Recognition	Revenue Recognition The Company generates revenue primarily from selling subscriptions for cloud-based products and services. The subscriptions are similar across all of the Company’s brands and are provided under contracts pursuant to which the Company has ongoing obligations to support the subscriber. These contracts are generally for service periods of up to 36 months and typically require payment in advance. The Company recognizes the associated revenue ratably over the service period , whether the associated revenue is derived from a direct subscriber or through a reseller. Deferred revenue represents the liability to subscribers for advance billings for services not yet provided and the fair value of the assumed liability outstanding for subscriber relationships purchased in an acquisition. The Company sells domain name registrations that provide a subscriber with the exclusive use of a domain name. These domains are primarily obtained by one of the Company’s registrars on the subscriber’s behalf, or to a lesser extent by the Company from third-party registrars on the subscriber’s behalf. Domain registration fees are non-refundable. Revenue from the sale of a domain name registration by a registrar within the Company is recognized ratably over the subscriber’s service period as the Company has the obligation to provide support over the domain term. Revenue from the sale of a domain name registration purchased by the Company from a third-party registrar is recognized when the subscriber is billed on a gross basis as there are no remaining Company obligations once the sale to the subscriber occurs, and the Company has full discretion on the sales price and bears all credit risk. Revenue from the sale of premium domains is recognized when persuasive evidence of an arrangement to sell such domains exists, delivery of an authorization key to access the domain name has occurred, the fee for the sale of the premium domain is fixed or determinable, and collection of the fee for the sale of the premium domain is deemed probable. Revenue from the sale of non-term based applications and services, such as certain online security products and professional technical services, referral fees and commissions, is recognized when the product is purchased, the service is provided or the referral fee or commission is earned, respectively. A substantial amount of the Company’s revenue is generated from transactions that are multiple-element service arrangements that may include hosting plans, domain name registrations, and other cloud-based products and services. The Company follows the provisions of the FASB, Accounting Standards Update (“ASU”) No. 2009-13 (“ASU 2009-13”), Revenue Recognition (Topic 605), Multiple-Deliverable Revenue Arrangements—a consensus of the FASB Emerging Issues Task Force and allocates revenue to each deliverable in a multiple-element service arrangement based on its respective relative selling price. Under ASU 2009-13, to treat deliverables in a multiple-element service arrangement as separate units of accounting, the deliverables must have standalone value upon delivery. If the deliverables have standalone value upon delivery, the Company accounts for each deliverable separately. Hosting services, domain name registrations, cloud-based products and services have standalone value and are often sold separately. When multiple deliverables included in a multiple-element service arrangement are separated into different units of accounting, the total transaction amount is allocated to the identified separate units based on a relative selling price hierarchy. The Company determines the relative selling price for a deliverable based on vendor specific objective evidence (“VSOE”) of fair value, if available, or best estimate of selling price (“BESP”), if VSOE is not available. The Company has determined that third-party evidence of selling price (“TPE”) is not a practical alternative due to differences in its multi-brand offerings compared to competitors and the lack of availability of relevant third-party pricing information. The Company has not established VSOE for its offerings due to lack of pricing consistency, the introduction of new products, services and other factors. Accordingly, the Company generally allocates revenue to the deliverables in the arrangement based on the BESP. The Company determines BESP by considering its relative selling prices, competitive prices in the marketplace and management judgment; these selling prices, however, may vary depending upon the particular facts and circumstances related to each deliverable. The Company analyzes the selling prices used in its allocation of transaction amount, at a minimum, on a quarterly basis. Selling prices are analyzed on a more frequent basis if a significant change in the Company's business necessitates a more timely analysis. The Company maintains a reserve for refunds and chargebacks related to revenue that has been recognized and is expected to be refunded.
Direct Costs of Revenue	Direct Costs of Revenue The Company’s direct costs of revenue include only those costs directly incurred in connection with the provision of its cloud-based products and services. The direct costs of registering domain names with registries are spread over the terms of the arrangement and the cost of reselling domains of other third-party registrars are expensed as incurred. Cost of revenue includes depreciation on data center equipment and support infrastructure and amortization expense related to the amortization of long-lived intangible assets.
Engineering and Development Costs	Engineering and Development Costs Engineering and development costs incurred in the development and maintenance of the Company’s technology infrastructure are expensed as incurred.
Sales and Marketing Costs	Sales and Marketing Costs The Company engages in sales and marketing through various online marketing channels, which include affiliate and search marketing as well as online partnerships. The Company expenses sales and marketing costs as incurred.
Foreign Currency	Foreign Currency The Company has sales in a number of foreign currencies. In 2013, the Company commenced operations in foreign locations which report in the local currency. The assets and liabilities of the Company’s foreign locations are translated into U.S. dollars at current exchange rates as of the balance sheet date, and revenue and expenses are translated at average monthly exchange rates. The resulting translation adjustments are recorded as a separate component of stockholders’ equity and have not been material. Foreign currency transaction gains and losses relate to the settlement of assets or liabilities in another currency.
Income Taxes	Income Taxes Income taxes are accounted for in accordance with ASC 740, Accounting for Income Taxes , or ASC 740. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. In addition, ASC 740 clarifies the accounting for income taxes by prescribing a minimum recognition threshold that a tax position is required to meet before being recognized in the financial statements. The Company recognizes the effect of income tax positions only if those positions are more likely than not to be sustained. Recognized income tax positions are measured at the largest amount that is more likely than not to be realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company had no unrecognized tax benefits in the years ended December 31, 2015 and 2016 . The Company provided for unrecognized tax benefits of $1.1 million in the year ended December 31, 2017 . The Company records interest related to unrecognized tax benefits in interest expense and penalties in operating expenses. During the
Stock-Based Compensation	Stock-Based Compensation The Company may issue restricted stock units, restricted stock awards and stock options which vest upon the satisfaction of a performance condition and/or a service condition. The Company follows the provisions of ASC 718, Compensation—Stock Compensation , or ASC 718, which requires employee stock-based payments to be accounted for under the fair value method. Under this method, the Company is required to record compensation cost based on the estimated fair value for stock-based awards granted over the requisite service periods for the individual awards, which generally equals the vesting periods, net of estimated forfeitures. The Company uses the straight-line amortization method for recognizing stock-based compensation expense. In addition, for stock-based awards where vesting is dependent upon achieving certain performance goals, the Company estimates the likelihood of achieving the performance goals against established performance targets. The Company estimates the fair value of employee stock options on the date of grant using the Black-Scholes option-pricing model, which requires the use of highly subjective estimates and assumptions. For restricted stock awards granted, the Company estimates the fair value of each restricted stock award based on the closing trading price of its common stock on the date of grant. In March 2016, the FASB issued Accounting Standards Update No. 2016-09, Compensation-Stock Compensation: Improvements to Employee Share-Based Payment Accounting . The guidance simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification of excess tax benefits in the consolidated statements of cash flows. This amendment is effective for annual periods beginning after December 15, 2016, and early adoption is permitted. The Company elected to early adopt the new guidance in the fourth quarter of fiscal year 2016, which requires it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. The impact of the early adoption resulted in the following: • Due to the Company's net shortfall position upon the time of adoption, the new standard resulted in additional tax expense in its provision for income taxes rather than paid-in capital of $0.9 million for the year ended December 31, 2016. The Company's beginning retained earnings was not impacted by the early adoption as the Company had a full valuation allowance against the U.S. deferred tax assets as of December 31, 2015. • As a result of prior guidance that required excess tax benefits to reduce taxes payable prior to recognition as an increase in paid in capital, the Company had not recognized certain deferred tax assets (loss carryforwards) that could be attributed to tax deductions related to equity compensation in excess of compensation recognized for financial reporting. As of January 1, 2016, the Company had generated federal and state net operating loss carryforwards due to excess tax benefits of $1.5 million and $0.7 million , respectively. • The Company elected to eliminate the forfeiture rate and adopted the new policy to account for forfeitures in the period that they are incurred, and applied this policy on a modified retrospective basis. The impact of eliminating the forfeiture rate increased the stock compensation recorded in 2016 by $0.9 million , which included an immaterial prior period adjustment that the Company recorded through the consolidated statement of operations and comprehensive loss for the year ended December 31, 2016.
Net Loss per Share	Net Loss per Share The Company considered ASC 260-10, Earnings per Share , or ASC 260-10, which requires the presentation of both basic and diluted earnings per share in the consolidated statements of operations and comprehensive loss. The Company’s basic net loss per share is computed by dividing net loss by the weighted average number of shares of common stock outstanding for the period, and, if there are dilutive securities, diluted income per share is computed by including common stock equivalents which includes shares issuable upon the exercise of stock options, net of shares assumed to have been purchased with the proceeds, using the treasury stock method. The Company’s potentially dilutive shares of common stock are excluded from the diluted weighted-average number of shares of common stock outstanding as their inclusion in the computation would be anti-dilutive due to net losses.
Guarantees	Guarantees The Company has the following guarantees and indemnifications: In connection with its acquisitions of companies and assets from third parties, the Company may provide indemnification or guarantees to the sellers in the event of damages for breaches or other claims covered by such agreements. In connection with various vendor contracts, including those by which a product or service of a third party is offered to subscribers of the Company, the Company may guarantee the obligations of its subsidiaries or provide indemnification to the vendors in the event of damages for breaches or other claims covered by the contracts. As permitted under Delaware and other applicable law, the Company’s charter and by-laws and those of its subsidiary companies provide that the Company shall indemnify its officers and directors for certain liabilities, including those incurred by reason of the fact that the officer or director is, was, or has agreed to serve as an officer or director of the Company. The maximum potential amount of future payments the Company could be required to make under these indemnification provisions is unlimited. The Company leases office space and equipment under various operating leases. The Company has standard indemnification arrangements under these leases that require the Company to indemnify the lessor against losses, liabilities and claims incurred in connection with the premises or equipment covered by the Company’s lease agreements, the Company’s use of the premises, property damage or personal injury and breach of the agreement.
Recent Accounting Pronouncements	Recent Accounting Pronouncements - Recently Adopted In March 2016, the FASB issued ASU No. 2016-07, Investments—Equity Method and Joint Ventures: Simplifying the Transition to the Equity Method of Accounting . This new guidance removes the requirement for retroactive adjustment when an increase or decrease in the level of ownership qualifies an investment for the equity method. This amendment is effective for fiscal years beginning after December 15, 2016. The adoption of this standard did not have a material impact on the Company's financial position or results of operations. In January 2017, the FASB issued Accounting Standards Update No. 2017-04, Intangibles - Goodwill and Other: Simplifying the Test for Goodwill Impairment . This new standard eliminates step two of the prior goodwill test, and instead requires that an entity perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. This amendment is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019, and should be applied on a prospective basis. The Company elected to early adopt the provisions of ASU 2017-04 effective in the fourth quarter of fiscal year 2017, which simplified the process of calculating the $12.1 million impairment to goodwill during the fourth quarter of fiscal year 2017. Recent Accounting Pronouncements - Recently Issued In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU 2014-09, which supersedes nearly all existing revenue recognition guidance under U.S. GAAP. Since then, the FASB has also issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606), Principals versus Agent Considerations, ASU 2016-10, Revenue from Contracts with Customers (Topic 606), Identifying Performance Obligations and Licensing , and ASU 2017-13, Revenue Recognition (Topic 605) , Revenue from Contracts with Customers (Topic 606) , Leases (Topic 840) , and Leases (Topic 842) , Amendments to SEC Paragraphs Pursuant to the Staff Announcement at the July 20, 2017 EITF Meeting and Rescission of Prior SEC Staff Announcements and Observer Comments, which further elaborate on the original ASU No. 2014-09. The core principle of these updates is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgments and estimates may be required within the revenue recognition process than are required under existing U.S. GAAP. In July 2015, the FASB approved a one-year deferral of the effective date to January 1, 2018, with early adoption to be permitted as of the original effective date of January 1, 2017. Once this standard becomes effective, companies may use either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures) (the "modified retrospective approach"). The Company has performed an initial assessment of ASU 2014-09, and expects that this new guidance will impact the timing of when certain sales incentive payments, primarily to external parties, are charged to expense as these costs must be deferred over the life of the related customer relationship. The Company also expects that a small portion of its revenue recognition will be impacted by this new guidance. The Company has completed an initial quantification of the changes from adoption of ASU 2014-09, and believes that the deferral of certain sales incentive payments may materially impact the timing of expenses in the initial periods following adoption, and that future revenue will not be materially impacted by this adoption. The Company expects that the impact to opening retained earnings will be approximately $67.0 million , which consists of an $83.0 million deferred asset relating to customer acquisition costs and a $6.0 million deferred asset for domain registration costs, partially offset by a $22.0 million liability for deferred revenue. The Company is in the process of evaluating the deferred tax impact of these changes, and expects to complete this evaluation during the first quarter of fiscal year 2018. The deferred tax impact may further impact the adjustment to retained earnings. Further, the Company expects to adopt ASU 2014-09 under the modified retrospective approach. In January 2016, the FASB issued Accounting Standards Update No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . This new standard enhances the reporting model for financial instruments to provide users of financial statements with more decision-useful information. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements, but does not believe that this will have a material impact on its consolidated financial statements. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, Leases . Since then, the FASB has also issued ASU 2017-13, Revenue Recognition (Topic 605) , Revenue from Contracts with Customers (Topic 606) , Leases (Topic 840) , and Leases (Topic 842): Amendments to SEC Paragraphs Pursuant to the Staff Announcement at the July 20, 2017 EITF Meeting and Rescission of Prior SEC Staff Announcements and Observer Comments, which further elaborates on the original ASU No. 2016-02. The new standard establishes a right-of-use (ROU) model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach is required for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements, but expects that that adoption will increase its assets and liabilities. In August 2016, the FASB issued Accounting Standards Update No. 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments . This new standard clarifies certain statement of cash flow presentation issues. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In October 2016, the FASB issued Accounting Standards Update No. 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory . This new standard improves the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In November 2016, the FASB issued Accounting Standards Update No. 2016-18, Statement of Cash Flows: Restricted Cash . This new standard requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and restricted cash. This amendment is effective for annual periods beginning after December 15, 2017, and early adoption is permitted. The Company does not believe the adoption of this ASU will have a material impact on its consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718). This new standard provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. This amendment is effective for annual or interim periods in fiscal years beginning after December 15, 2017, and should be applied prospectively to an award modified on or after the adoption date. The Company will apply this new guidance to any modifications, based on the new definition of a modification, for all periods beginning on or after January 1, 2018. The Company is currently evaluating the impact of its pending adoption of the new standard on its consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815) : Targeted Improvements to Accounting for Hedging Activities. This new guidance better aligns an entity's risk management activities and financial reporting for hedging relationships through changes to the designation and measurement guidance for qualifying hedging relationships and to the method of presenting hedge results. The amendments in this guidance require an entity to present the earnings effect of the hedging instrument in the same income statement line item in which the earnings effect of the hedged item is reported, to allow users to better understand the results and costs of an entity's hedging program. This new guidance is effective for fiscal years beginning after December 15, 2019. The amended presentation and disclosure guidance is required only prospectively, while the measurement guidance should be applied to hedges existing at the time of adoption through a one-time cumulative-effect adjustment to accumulated other comprehensive income with respect to the elimination of the separate measurement of ineffectiveness with a corresponding adjustment to the opening balance of the retained earnings. The Company is currently evaluating the impact of its pending adoption of the new guidance on its consolidated financial statements.

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Estimated Useful Lives	Depreciation is computed using the straight-line method over the estimated useful lives of the related assets as follows: Building Thirty-five years Software Two to three years Computers and office equipment Three years Furniture and fixtures Five years Leasehold improvements Shorter of useful life or remaining term of the lease
Potentially Dilutive Shares of Common Stock Excluded from the Diluted Weighted-average Number of Shares of Common Stock Outstanding	For the Year Ended December 31, 2015 2016 2017 (in thousands, except share amounts and per share data) Computation of basic and diluted net loss per share: Net loss attributable to Endurance International Group Holdings, Inc. $ (25,770 ) $ (72,831 ) $ (107,308 ) Net loss per share attributable to Endurance International Group Holdings, Inc.: Basic and diluted $ (0.20 ) $ (0.55 ) $ (0.78 ) Weighted average number of common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc.: Basic and diluted 131,340,557 133,415,732 137,322,201
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following number of weighted average potentially dilutive shares were excluded from the calculation of diluted loss per share because the effect of including such potentially dilutive shares would have been anti-dilutive: For the Year Ended December 31, 2015 2016 2017 Restricted Stock Awards and Units 3,019,349 8,019,241 8,967,840 Options 6,723,589 10,380,991 10,728,795 Total 9,742,938 18,400,232 19,696,635

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Summary of Deferred Consideration Related to Acquisition	Components of deferred consideration short-term and long-term as of December 31, 2016, consisted of the following: Short- term Long- term (in thousands) Mojoness, Inc. (Acquired in 2012) $ 818 $ — Verio (Acquired in 2015) 50 — Social Booster (Acquired in 2016) 40 25 AppMachine (Acquired in 2016) 4,365 7,419 Total $ 5,273 $ 7,444 Components of deferred consideration short-term and long-term as of December 31, 2017, consisted of the following: Short- term Long- term (in thousands) AppMachine (Acquired in 2016) 4,365 3,551 Total $ 4,365 $ 3,551

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Basis of Fair Value Measurements	Basis of Fair Value Measurements Balance Quoted Prices in Active Markets for Identical Items (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (in thousands) Balance at December 31, 2016 Financial assets: Interest rate cap (included in other assets) $ 979 — $ 979 $ — Total financial assets $ 979 $ — $ 979 $ — Financial liabilities: Contingent earn-out consideration $ 818 — — $ 818 Total financial liabilities $ 818 $ — $ — $ 818 Balance at December 31, 2017 Financial assets: Interest rate cap (included in other assets) $ 452 — $ 452 $ — Total financial assets $ 452 $ — $ 452 $ —
Summary of Changes in the Financial Liabilities Measured on a Recurring Basis Using Level 3 Inputs	The following table summarizes the changes in the financial liabilities measured on a recurring basis using Level 3 inputs as of December 31, 2016 and 2017 : Amount (in thousands) Financial liabilities measured using Level 3 inputs at December 31, 2015 $ 1,469 Payment of contingent earn-outs related to 2012 acquisitions (668 ) Change in fair value of contingent earn-outs 17 Financial liabilities measured using Level 3 inputs at December 31, 2016 818 Payment of contingent earn-outs related to 2012 acquisitions (818 ) Change in fair value of contingent earn-outs — Financial liabilities measured using Level 3 inputs at December 31, 2017 $ —

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Components of Property and Equipment	Components of property and equipment consisted of the following: As of December 31, 2016 2017 (in thousands) Land $ 790 $ 790 Building 5,517 5,037 Software 52,130 82,618 Computers and office equipment 143,091 153,273 Furniture and fixtures 10,892 18,825 Leasehold improvements 21,244 22,260 Construction in process 6,691 3,800 Property and equipment—at cost 240,355 286,603 Less accumulated depreciation (145,083 ) (191,151 ) Property and equipment—net $ 95,272 $ 95,452
Summary of Software Assets under Capital Lease	As of December 31, 2016 and 2017 , the Company’s software shown in the above table included the software assets under a capital lease as follows: As of December 31, 2016 2017 (in thousands) Software $ 21,499 $ 17,256 Less accumulated depreciation (14,750 ) (2,265 ) Assets under capital lease—net $ 6,749 $ 14,991
Summary of Future Minimum Lease Payments under Capital Lease	At December 31, 2017 , the expected future minimum lease payments under the capital lease discussed above were approximately as follows: Amount (in thousands) 2018 8,384 2019 7,977 Total minimum lease payments $ 16,361 Less amount representing interest (1,012 ) Present value of minimum lease payments (capital lease obligation) $ 15,349 Current portion $ 7,630 Long-term portion $ 7,719

Goodwill and Other Intangible36

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Goodwill Balances	The following table summarizes the changes in the Company’s goodwill balances as of December 31, 2016 and 2017 : Web presence Email marketing Domain Total Amount (in thousands) Goodwill balance at December 31, 2015 $ 1,207,255 $ — $ — $ 1,207,255 Goodwill related to 2015 acquisitions 5,978 — — 5,978 Goodwill related to 2016 acquisitions 43,019 604,305 — 647,324 Foreign translation impact (648 ) — — (648 ) Goodwill balance at December 31, 2016 1,255,604 604,305 — 1,859,909 Reallocation of goodwill (41,987 ) — 41,987 — Foreign translation impact 2,802 — 2,802 Impairment — — (12,129 ) (12,129 ) Goodwill balance at December 31, 2017 $ 1,216,419 $ 604,305 $ 29,858 $ 1,850,582
Summary of Other Intangible Assets	At December 31, 2016 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 284,005 $ 111,348 $ 172,657 7 years Subscriber relationships 659,662 345,070 314,592 7 years Trade-names 133,805 57,789 76,016 8 years Intellectual property 34,084 10,270 23,814 13 years Domain names available for sale 29,954 4,976 24,978 Indefinite Leasehold interests 314 314 — 1 year Total December 31, 2016 $ 1,141,824 $ 529,767 $ 612,057 At December 31, 2017 , other intangible assets consisted of the following: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted Average Useful Life (dollars in thousands) Developed technology $ 285,911 $ 149,514 $ 136,397 7 years Subscriber relationships 659,732 431,938 227,794 7 years Trade-names 134,054 73,019 61,035 8 years Intellectual property 34,313 27,336 6,977 5 years Domain names available for sale 30,458 7,221 23,237 Indefinite Leasehold interests 314 314 — 1 year Total December 31, 2017 $ 1,144,782 $ 689,342 $ 455,440
Summary of Expected Future Amortization of Other Intangible Assets	At December 31, 2017 , the expected future amortization of the other intangible assets, excluding indefinite life and in-process research and development intangibles, was approximately as follows: Year Ending December 31, Amount (in thousands) 2018 $ 100,637 2019 82,705 2020 69,792 2021 60,676 2022 36,232 Thereafter 82,161 Total $ 432,203

Notes Payable (Tables)

Notes Payable (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	As of December 31, 2016 and 2017, the Incremental First Lien had an outstanding balance of: As of December 31, 2016 2017 Incremental First Lien Term Loan $ 720,300 $ — Unamortized deferred financing costs (25,869 ) — Unamortized original issue discounts (19,571 ) — Net Incremental First Lien Term Loan 674,860 — Current portion of Incremental First Lien Term Loan 14,700 — Incremental First Lien Term Loan - long term $ 660,160 $ — As of December 31, 2017, the 2017 First Lien had an outstanding balance of: As of December 31, 2017 (in thousands) 2017 First Lien Term Loan $ 1,605,792 Unamortized deferred financing costs (22,456 ) Unamortized original issue discount (20,139 ) Net 2017 First Lien Term Loan 1,563,197 Current portion of 2017 First Lien Term Loan 33,945 2017 First Lien Term Loan - long term $ 1,529,252 At December 31, 2016 and 2017 , notes payable, net of original issuance discounts (sometimes referred to as "OID") and deferred financing costs, consisted of the following: As of December 31, 2016 2017 (in thousands) 2017 First Lien Term Loan $ — $ 1,563,197 2013 First Lien Term Loan 985,640 — Incremental First Lien Term Loan 674,860 — Senior Notes 326,480 329,048 Revolving Credit Facilities — — Total Notes Payable 1,986,980 1,892,245 Current portion of Notes Payable 35,700 33,945 Notes Payable - long-term $ 1,951,280 $ 1,858,300 As of December 31, 2016 and 2017, the Senior Notes had an outstanding balance of: As of December 31, 2016 2017 (in thousands) Senior Notes $ 350,000 $ 350,000 Unamortized deferred financing costs (17,238 ) (15,280 ) Unamortized original issue discounts (6,282 ) (5,672 ) Net Senior Notes 326,480 329,048 Current portion of Senior Notes — — Senior Notes - long term $ 326,480 $ 329,048 As of December 31, 2016 and 2017 , the 2013 First Lien had an outstanding balance of: As of December 31, 2016 2017 (in thousands) 2013 First Lien Term Loan $ 985,875 $ — Unamortized deferred financing costs (235 ) — Net 2013 First Lien Term Loan 985,640 — Current portion of 2013 First Lien Term Loan 21,000 — 2013 First Lien Term Loan - long term $ 964,640 $ —
Summary of Maturity of the Notes Payable	The maturity of the notes payable at December 31, 2017 is as follows: Amounts Maturity date as of December 31, (in thousands) 2018 $ 33,945 2019 33,945 2020 33,945 2021 33,945 2022 33,945 Thereafter 1,436,067 Total $ 1,605,792
Summary of Interest Rates and Interest Expense	The following table provides a summary of loan interest rates incurred and interest expense for the years ended December 31, 2015 , 2016 and 2017 : For the Year Ended December 31, 2015 2016 2017 (dollars in thousands) Interest rate—LIBOR 5.00%-7.75% 4.49%-7.75% 5.14%-6.68% Interest rate—reference 8.50 % 6.75%-8.75% * Interest rate—Notes — % 10.875 % 10.875 % Non-refundable fee—unused facility 0.50 % 0.50 % 0.50 % Interest expense and service fees $ 56,760 $ 140,470 $ 138,041 Loss on extinguishment of debt $ — $ — $ 992 Deferred financing costs immediately expensed $ — $ — $ 5,487 Amortization of deferred financing fees $ 82 $ 6,073 $ 7,316 Amortization of original issue discounts $ — $ 2,970 $ 3,860 Amortization of net present value of deferred consideration $ 1,264 $ 2,617 $ 632 Other interest expense $ 722 $ 758 $ 814 Total interest expense $ 58,828 $ 152,888 $ 157,142

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plan	The weighted-average assumptions used to compute stock-based compensation expense for awards granted under the 2013 Stock Incentive Plan during the years ended December 31, 2015, 2016 and 2017 are as follows: 2015 2016 2017 Risk-free interest rate 1.8 % 1.5 % 2.2 % Expected volatility 56.1 % 53.1 % 50.5 % Expected life (in years) 6.25 6.25 6.25 Expected dividend yield — — —
Summary of Stock Options	The following table provides a summary of the Company’s stock options as of December 31, 2017 and the stock option activity for all stock options granted under the 2013 Plan during the year ended December 31, 2017 (dollars in thousands except exercise price): Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In years) Aggregate Intrinsic Value(3) Outstanding at December 31, 2016 9,607,431 $ 12.79 Granted 774,018 $ 7.84 Exercised (672 ) $ 8.05 Forfeited (1,064,535 ) $ 12.55 Canceled (741,092 ) $ 13.69 Outstanding at December 31, 2017 8,575,150 $ 12.30 6.2 $ 470 Exercisable as of December 31, 2017 6,246,799 $ 12.80 5.5 $ 10 Expected to vest after December 31, 2017(1) 2,328,351 $ 10.96 8.1 $ 1 Exercisable as of December 31, 2017 and expected to vest thereafter(2) 8,575,150 $ 12.30 6.2 $ 470 (1) This represents the number of unvested options outstanding as of December 31, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of December 31, 2017 plus the number of unvested options outstanding as of December 31, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2017 of $8.40 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options. The following table provides a summary of the Company’s stock options as of December 31, 2017 and the stock option activity for all stock options granted under the 2011 Plan during the year ended December 31, 2017: Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (In years) Aggregate Intrinsic Value(3) (In thousands) Outstanding at December 31, 2016 1,931,830 $ 8.73 Granted 14,724 $ 8.15 Exercised (355,557 ) $ 5.75 Forfeited (531,988 ) $ 10.04 Canceled (170,749 ) $ 10.62 Outstanding at December 31, 2017 888,260 $ 8.75 4.3 $ 635 Exercisable as of December 31, 2017 538,766 $ 8.40 3.8 $ 514 Expected to vest after December 31, 2017(1) 349,494 $ 9.29 5.0 $ 121 Exercisable as of December 31, 2017 and expected to vest thereafter(2) 888,260 $ 8.75 4.3 $ 635 (1) This represents the number of unvested options outstanding as of December 31, 2017 that are expected to vest in the future. (2) This represents the number of vested options as of December 31, 2017 plus the number of unvested options outstanding as of December 31, 2017 that are expected to vest in the future. (3) The aggregate intrinsic value was calculated based on the positive difference between the estimated fair value of the Company’s common stock on December 31, 2017 of $8.40 per share, or the date of exercise, as appropriate, and the exercise price of the underlying options.
Summary of Restricted Stock Awards and Restricted Stock Units	The following table provides a summary of the Company’s restricted stock award activity for the 2013 Plan during the year ended December 31, 2017 : Restricted Stock Awards Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 7,332,537 $ 13.21 Granted 160,428 $ 8.15 Vested (3,695,045 ) $ 12.56 Canceled (364,974 ) $ 12.13 Non-vested at December 31, 2017 3,432,946 $ 13.79 The following table provides a summary of the Company’s restricted stock unit activity for the 2011 Plan during the year ended December 31, 2017: Restricted Stock Units Weighted Average Grant Date Fair Value Non-vested at December 31, 2016 1,473,655 $ 9.25 Granted 1,324,328 $ 7.99 Vested (659,019 ) $ 7.56 Canceled (597,823 ) $ 8.48 Non-vested at December 31, 2017 1,541,141 $ 8.30 three - or four -year period, unless otherwise determined by the Company’s board of directors. The following table provides a summary of the Company’s restricted stock unit activity for the 2013 Plan during the year ended December 31, 2017 : Restricted Stock Units Weighted Average Grant Date Fair Value December 31, 2016 100,369 $ 12.00 Granted 4,115,549 $ 7.94 Vested (804,920 ) $ 8.01 Canceled (406,861 ) $ 7.89 December 31, 2017 3,004,137 $ 7.93
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions	The weighted-average assumptions used to compute stock-based compensation expense for awards granted under the 2011 Stock Incentive Plan during the years ended December 31, 2016 and 2017 are as follows: 2016 2017 Risk-free interest rate 1.27 % 1.98 % Expected volatility 53.1 % 49.6 % Expected life (in years) 4.75 4.75 Expected dividend yield — —
Summary of Total Stock-Based Compensation Expense	The following table presents total stock-based compensation expense recorded in the consolidated statement of operations and comprehensive loss for all 2012 restricted stock awards and units issued prior to the IPO, and all awards granted under the Company’s 2013 Plan and the 2011 Plan: For the Year Ended December 31, 2015 2016 2017 (in thousands) Cost of revenue $ 1,975 $ 5,855 $ 6,135 Sales and marketing 3,285 8,702 8,658 Engineering and development 1,988 5,989 6,090 General and administrative 22,677 37,721 39,118 Total operating expense $ 29,925 $ 58,267 $ 60,001

Accumulated Other Comprehensi39

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss, Net of Tax	The components of accumulated other comprehensive loss, net of tax were as follows: Foreign Currency Translation Adjustments Unrealized Gains (Losses) on Cash Flow Hedges Total (in thousands) Balance at December 31, 2015 $ (1,798 ) $ 80 $ (1,718 ) Other comprehensive income (loss) (597 ) (1,351 ) (1,948 ) Balance at December 31, 2016 (2,395 ) (1,271 ) (3,666 ) Other comprehensive income (loss) 3,091 34 3,125 Balance at December 31, 2017 $ 696 $ (1,237 ) $ (541 )

Redeemable Non-Controlling In40

Redeemable Non-Controlling Interest (Tables)	12 Months Ended
	Dec. 31, 2017
Noncontrolling Interest [Abstract]
Redeemable Non-Controlling Interest	The following table presents changes in this redeemable non-controlling interest: Redeemable noncontrolling interest (in thousands) Balance as of December 31, 2016 $ 17,753 Accretion in excess of fair value 7,247 Payment of redeemable non-controlling interest (25,000 ) Balance as of December 31, 2017 $ —

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of Income (Loss) Before Income Taxes	The following table presents domestic and foreign components of income (loss) before income taxes for the periods presented: Year Ended December 31, 2015 2016 2017 (in thousands) United States $ 1,258 $ (137,197 ) $ (117,715 ) Foreign (1,046 ) (52,593 ) 540 Total income (loss) before income taxes $ 212 $ (189,790 ) $ (117,175 )
Components of Income Taxes Benefit and Expenses	The components of the provision (benefit) for income taxes consisted of the following: Year Ended December 31, 2015 2016 2017 (in thousands) Current: U.S. federal $ 1,827 $ 328 $ 319 State 696 744 2,610 Foreign 1,699 2,312 2,597 Total current provision 4,222 3,384 5,526 Deferred: U.S. federal (1,103 ) (44,447 ) (36,854 ) State 1,952 (6,225 ) (3,243 ) Foreign (818 ) (10,037 ) 9,377 Change in valuation allowance 7,089 (52,533 ) 7,913 Total deferred provision 7,120 (113,242 ) (22,807 ) Total expense (benefit) $ 11,342 $ (109,858 ) $ (17,281 )
Reconciliation of Statutory Federal Rate	The following table presents a reconciliation of the statutory federal rate, and the Company’s effective tax rate, for the periods presented: Year Ended December 31, 2015 2016 2017 U.S. federal taxes at statutory rate 34.0 % 35.0 % 35.0 % State income taxes, net of federal benefit 685.0 0.9 0.6 Nondeductible stock-based compensation 827.3 (1.5 ) (7.9 ) Nondeductible litigation expenses — — (7.9 ) Nondeductible transaction costs 856.5 (2.9 ) — Nontaxable gain on redemption of equity interest (674.9 ) — — Other foreign permanent differences 187.8 (0.4 ) (2.9 ) Credits — 3.7 1.1 Foreign rate differential 299.7 (4.6 ) 1.2 Change in valuation allowance—U.S. 3,398.6 31.2 (16.1 ) Change in valuation allowance—foreign (130.8 ) (4.1 ) 9.5 Rate change 216.5 0.4 7.5 Prior year true-up stock-based compensation—U.S. (132.8 ) — — Other (217.5 ) (0.5 ) (5.2 ) Total 5,349.4 % 57.2 % 14.9 %
Components of the Company's Deferred Income Tax Assets and Liabilities	The significant components of the Company’s deferred income tax assets and liabilities are as follows: As of December 31, 2016 2017 Deferred income tax assets: Net operating loss carry forward $ 76,060 $ 47,098 Credit carryforward 28,271 27,337 Other 5,414 (327 ) Deferred compensation 364 215 Deferred revenue 26,291 19,729 Other reserves 3,545 (72 ) Stock-based compensation 25,424 14,887 Total deferred income tax assets 165,369 108,867 Deferred income tax liabilities: Purchased intangible assets (119,719 ) (47,580 ) Goodwill (37,099 ) (27,922 ) Property and equipment (12,403 ) (9,024 ) Total deferred income tax liabilities (169,221 ) (84,526 ) Valuation allowance (36,091 ) (44,068 ) Net deferred income tax liabilities $ (39,943 ) $ (19,727 )
Schedule of Unrecognized Tax Benefits Roll Forward	The Company does not expect a significant change in the liability for unrecognized tax benefits in the next 12 months. Unrecognized tax benefits at December 31, 2016 $ — Addition for tax positions of prior years 734 Addition for tax positions of current year 395 Unrecognized tax benefits at December 31, 2017 $ 1,129

Severance and Other Exit Costs

Severance and Other Exit Costs (Tables)	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Summary of Activity Related to Company's Facilities Exit Costs Accrual	The following table provides a summary of the aggregate activity for the year ended December 31, 2017 related to the Company’s combined severance accrual for the 2017, 2016 and 2014 Restructuring Plans (together, the "Restructuring Plans"): Employee Severance (in thousands) Total Balance at December 31, 2016 $ 1,559 Severance charges 13,110 Cash paid (11,001 ) Balance at December 31, 2017 $ 3,668 The following table provides a summary of the aggregate activity for the year ended December 31, 2017 related to the Company’s combined Restructuring Plans facilities exit accrual: Facilities (in thousands) Total Balance at December 31, 2016 $ 9,020 Facility charges, net of estimated sublease income 2,700 Sublease income received 698 Cash paid (6,413 ) Balance at December 31, 2017 $ 6,005
Summary of Severance Charges	The following table presents restructuring charges recorded in the consolidated statement of operations and comprehensive loss for the periods presented: For the Year Ended December 31, 2015 2016 2017 (in thousands) Cost of revenue $ (45 ) $ 8,986 $ 4,100 Sales and marketing 555 6,550 3,586 Engineering and development 636 4,288 1,469 General and administrative 343 4,400 6,655 Total severance charges $ 1,489 $ 24,224 $ 15,810

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Minimum Annual Rental Payments Under these Leases	The Company has operating lease commitments for certain facilities and equipment that expire on various dates through 2026 . The following table outlines future minimum annual rental payments under these leases at December 31, 2017 : Year Ending December 31, Amount (in thousands) 2018 $ 21,526 2019 20,212 2020 19,633 2021 16,205 2022 13,772 Thereafter 36,612 Total minimum lease payments $ 127,960

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Summary of Related Party Transactions	The following table includes the amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the years ended December 31, 2015 , 2016 and 2017 relating to services provided by Tregaron and its affiliates under these agreements: For the Year Ended December 31, 2015 2016 2017 (in thousands) Cost of revenue $ 10,200 $ 12,200 $ 12,100 Sales and marketing 700 500 1,200 Engineering and development 1,100 1,300 1,300 General and administrative 300 300 200 Total related party transaction expense $ 12,300 $ 14,300 $ 14,800 The following table includes the revised amounts of related party transactions recorded in the consolidated statements of operations and comprehensive loss for the years ended December 31, 2015 , 2016 and 2017 relating to services provided by IBS under these agreements: For the Year Ended December 31, 2015 2016 2017 (in thousands) Revenue $ (1,300 ) $ (3,100 ) $ (4,250 ) Revenue (contra) 7,000 7,500 7,850 Total related party transaction impact to revenue $ 5,700 $ 4,400 $ 3,600 Cost of revenue 600 700 675 Total related party transaction expense, net $ 6,300 $ 5,100 $ 4,275

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables contain financial information for each reportable segment for the years ended December 31, 2015, 2016 and 2017, with the 2015 and 2016 results recast to conform with the 2017 presentation: Year ended December 31, 2015 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 596,687 $ — $ 144,628 $ 741,315 Gross profit 267,946 — 48,334 316,280 Net loss (34,049 ) — 8,279 (25,770 ) Plus: Interest expense, net (2) 56,663 — 1,751 58,414 Income tax expense (benefit) 12,756 — (1,414 ) 11,342 Depreciation 31,947 — 2,063 34,010 Amortization of other intangible assets 83,106 — 7,951 91,057 Stock-based compensation 25,513 — 4,412 29,925 Restructuring expenses 1,210 — 279 1,489 Transaction expenses and charges 8,265 — 1,317 9,582 Gain of unconsolidated entities (3) 9,200 — — 9,200 Impairment of other long-lived assets (4) — — — — Adjusted EBITDA $ 194,611 $ — $ 24,638 $ 219,249 Year ended December 31, 2016 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 648,732 $ 326,808 $ 135,602 $ 1,111,142 Gross profit 309,116 173,163 44,872 527,151 Net loss (24,382 ) (55,857 ) (990 ) (81,229 ) Plus: Interest expense, net (2) 68,617 81,469 2,226 $ 152,312 Income tax expense (benefit) (79,632 ) (33,543 ) 3,317 $ (109,858 ) Depreciation 33,590 23,747 3,023 $ 60,360 Amortization of other intangible assets 72,733 64,679 6,150 $ 143,562 Stock-based compensation 41,481 12,403 4,383 $ 58,267 Restructuring expenses 1,625 22,379 220 $ 24,224 Transaction expenses and charges 31,260 984 40 $ 32,284 Gain of unconsolidated entities (3) (565 ) — — $ (565 ) Impairment of other long-lived assets (4) 9,039 — — 9,039 Adjusted EBITDA $ 153,766 $ 116,261 $ 18,369 $ 288,396 Year ended December 31, 2017 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 641,993 $ 401,250 $ 133,624 $ 1,176,867 Gross profit 298,687 254,941 19,309 572,937 Net loss (70,375 ) (10,615 ) (18,794 ) (99,784 ) Plus: Interest expense, net (2) 67,491 86,914 2,001 $ 156,406 Income tax expense (benefit) 2,575 5,152 (25,008 ) (17,281 ) Depreciation 37,634 13,912 3,639 55,185 Amortization of other intangible assets 60,277 74,467 5,610 140,354 Stock-based compensation 46,641 6,934 6,426 60,001 Restructuring expenses 9,131 5,581 1,098 15,810 Transaction expenses and charges — 773 — 773 Gain of unconsolidated entities (3) (110 ) — — (110 ) Impairment of other long-lived assets (4) 600 — 30,860 31,460 SEC investigations reserve 4,323 2,751 926 8,000 Adjusted EBITDA $ 158,187 $ 185,869 $ 6,758 $ 350,814 Total assets $ 1,534,225 $ 903,869 $ 144,615 (1) Revenue excludes intercompany sales of domain sales and domain services from the domain segment to the web presence segment of $4.9 million , $7.6 million and $9.9 million , for fiscal years 2015, 2016 and 2017, respectively. (2) Interest expense includes impact of amortization of deferred financing costs, original issue discounts and interest income. For the year ended December 31, 2017, it also includes $6.5 million of deferred financing costs and OID immediately expensed upon the 2017 Refinancing. (3) The (gain) loss of unconsolidated entities is reported on a net basis for the years ended December 31, 2016 and 2017 . The The year ended December 31, 2016 includes an $11.4 million gain on the Company's investment in WZ UK, Ltd. This gain was generated on January 6, 2016, when the Company increased its ownership stake in WZ UK from 49% to 57.5% , which required a revaluation of its existing investment to its implied fair value. This gain was offset by the following: a loss of $4.8 million on an investment in AppMachine B.V., which was generated on July 27, 2016, when the Company increased its ownership stake in AppMachine from 40% to 100% , which required a revaluation of the existing investment to its implied fair value; a loss of $4.7 million on the impairment of the Company's 33% equity investment in Fortifico Limited; and the Company's proportionate share of net losses from unconsolidated entities of $1.3 million . (4) The impairment of other long lived assets for the year ended December 31, 2016 includes $7.0 million of impairment charges related to developed and in-process technology related to the Webzai acquisition, and $2.0 million of internally developed software that was abandoned. The impairment of other long-lived assets for the year ended December 31, 2017 includes $13.8 million related to certain domain name intangible assets, $0.6 million to write off a debt investment in a privately held entity, $12.1 million related to impairment of goodwill associated with the domain segment, and $4.9 million related to developed technology and customer relationships associated with the Directi acquisition. Revenue, classified by the major geographic areas in which the Company's customers are located, was as follows: Year Ended December 31, 2015 2016 2017 (in thousands) United States $ 465,446 $ 787,915 $ 845,305 International 275,869 323,227 331,562 Total $ 741,315 $ 1,111,142 $ 1,176,867

Geographic and Other Informat46

Geographic and Other Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Revenues Classified by Major Geographic Areas	The following tables contain financial information for each reportable segment for the years ended December 31, 2015, 2016 and 2017, with the 2015 and 2016 results recast to conform with the 2017 presentation: Year ended December 31, 2015 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 596,687 $ — $ 144,628 $ 741,315 Gross profit 267,946 — 48,334 316,280 Net loss (34,049 ) — 8,279 (25,770 ) Plus: Interest expense, net (2) 56,663 — 1,751 58,414 Income tax expense (benefit) 12,756 — (1,414 ) 11,342 Depreciation 31,947 — 2,063 34,010 Amortization of other intangible assets 83,106 — 7,951 91,057 Stock-based compensation 25,513 — 4,412 29,925 Restructuring expenses 1,210 — 279 1,489 Transaction expenses and charges 8,265 — 1,317 9,582 Gain of unconsolidated entities (3) 9,200 — — 9,200 Impairment of other long-lived assets (4) — — — — Adjusted EBITDA $ 194,611 $ — $ 24,638 $ 219,249 Year ended December 31, 2016 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 648,732 $ 326,808 $ 135,602 $ 1,111,142 Gross profit 309,116 173,163 44,872 527,151 Net loss (24,382 ) (55,857 ) (990 ) (81,229 ) Plus: Interest expense, net (2) 68,617 81,469 2,226 $ 152,312 Income tax expense (benefit) (79,632 ) (33,543 ) 3,317 $ (109,858 ) Depreciation 33,590 23,747 3,023 $ 60,360 Amortization of other intangible assets 72,733 64,679 6,150 $ 143,562 Stock-based compensation 41,481 12,403 4,383 $ 58,267 Restructuring expenses 1,625 22,379 220 $ 24,224 Transaction expenses and charges 31,260 984 40 $ 32,284 Gain of unconsolidated entities (3) (565 ) — — $ (565 ) Impairment of other long-lived assets (4) 9,039 — — 9,039 Adjusted EBITDA $ 153,766 $ 116,261 $ 18,369 $ 288,396 Year ended December 31, 2017 Web presence Email marketing Domain Total (in thousands) Revenue (1) $ 641,993 $ 401,250 $ 133,624 $ 1,176,867 Gross profit 298,687 254,941 19,309 572,937 Net loss (70,375 ) (10,615 ) (18,794 ) (99,784 ) Plus: Interest expense, net (2) 67,491 86,914 2,001 $ 156,406 Income tax expense (benefit) 2,575 5,152 (25,008 ) (17,281 ) Depreciation 37,634 13,912 3,639 55,185 Amortization of other intangible assets 60,277 74,467 5,610 140,354 Stock-based compensation 46,641 6,934 6,426 60,001 Restructuring expenses 9,131 5,581 1,098 15,810 Transaction expenses and charges — 773 — 773 Gain of unconsolidated entities (3) (110 ) — — (110 ) Impairment of other long-lived assets (4) 600 — 30,860 31,460 SEC investigations reserve 4,323 2,751 926 8,000 Adjusted EBITDA $ 158,187 $ 185,869 $ 6,758 $ 350,814 Total assets $ 1,534,225 $ 903,869 $ 144,615 (1) Revenue excludes intercompany sales of domain sales and domain services from the domain segment to the web presence segment of $4.9 million , $7.6 million and $9.9 million , for fiscal years 2015, 2016 and 2017, respectively. (2) Interest expense includes impact of amortization of deferred financing costs, original issue discounts and interest income. For the year ended December 31, 2017, it also includes $6.5 million of deferred financing costs and OID immediately expensed upon the 2017 Refinancing. (3) The (gain) loss of unconsolidated entities is reported on a net basis for the years ended December 31, 2016 and 2017 . The The year ended December 31, 2016 includes an $11.4 million gain on the Company's investment in WZ UK, Ltd. This gain was generated on January 6, 2016, when the Company increased its ownership stake in WZ UK from 49% to 57.5% , which required a revaluation of its existing investment to its implied fair value. This gain was offset by the following: a loss of $4.8 million on an investment in AppMachine B.V., which was generated on July 27, 2016, when the Company increased its ownership stake in AppMachine from 40% to 100% , which required a revaluation of the existing investment to its implied fair value; a loss of $4.7 million on the impairment of the Company's 33% equity investment in Fortifico Limited; and the Company's proportionate share of net losses from unconsolidated entities of $1.3 million . (4) The impairment of other long lived assets for the year ended December 31, 2016 includes $7.0 million of impairment charges related to developed and in-process technology related to the Webzai acquisition, and $2.0 million of internally developed software that was abandoned. The impairment of other long-lived assets for the year ended December 31, 2017 includes $13.8 million related to certain domain name intangible assets, $0.6 million to write off a debt investment in a privately held entity, $12.1 million related to impairment of goodwill associated with the domain segment, and $4.9 million related to developed technology and customer relationships associated with the Directi acquisition. Revenue, classified by the major geographic areas in which the Company's customers are located, was as follows: Year Ended December 31, 2015 2016 2017 (in thousands) United States $ 465,446 $ 787,915 $ 845,305 International 275,869 323,227 331,562 Total $ 741,315 $ 1,111,142 $ 1,176,867
Schedule of Tangible Long-Lived Assets	The following table presents the amount of tangible long-lived assets by geographic area: 2016 2017 (in thousands) United States $ 89,147 $ 89,325 International 6,125 6,127 Total $ 95,272 $ 95,452

Quarterly Financial Data (una47

Quarterly Financial Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Schedule of Condensed Income Statement	The following table presents the Company’s unaudited quarterly financial data: For the three months ended March 31, June 30, Sept. 30, Dec. 31, March 31, June 30, Sept. 30, Dec. 31, (in thousands, except per share data) Revenue $ 237,113 $ 290,713 $ 291,193 $ 292,123 $ 295,137 $ 292,258 $ 295,222 $ 294,250 Gross profit 100,637 137,636 141,766 147,112 146,388 145,675 136,357 144,517 Income (loss) from operations (66,311 ) (6,168 ) 8,879 24,260 13,594 12,647 (1,070 ) 14,660 Net income (loss) attributable to Endurance International Group Holdings, Inc. $ 21,811 $ (28,040 ) $ (31,737 ) $ (34,865 ) $ (35,388 ) $ (39,129 ) $ (40,264 ) $ 7,473 Basic net income (loss) per share attributable to Endurance International Group Holdings, Inc. $ 0.17 $ (0.21 ) $ (0.24 ) $ (0.26 ) $ (0.26 ) $ (0.29 ) $ (0.29 ) $ 0.05 Diluted net income (loss) per share attributable to Endurance International Group Holdings, Inc. $ 0.16 $ (0.21 ) $ (0.24 ) $ (0.26 ) $ (0.26 ) $ (0.29 ) $ (0.29 ) $ 0.05

Supplemental Guarantor Financ48

Supplemental Guarantor Financial Information (Tables)	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Consolidated Balance Sheets	The following tables present supplemental condensed consolidating balance sheet information of the Company (“Parent”), the Issuer, the Subsidiary Guarantors and the Non-Guarantor Subsidiaries as of December 31, 2016 and December 31, 2017, and supplemental condensed consolidating results of operations and cash flow information for the years ended December 31, 2015, 2016 and 2017: Condensed Consolidating Balance Sheets December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 3 $ 4 $ 39,034 $ 14,555 — $ 53,596 Restricted cash — — 2,620 682 — 3,302 Accounts receivable — — 10,148 2,940 — 13,088 Prepaid domain name registry fees — — 31,044 24,697 (297 ) 55,444 Prepaid expenses & other current assets — 81 17,996 10,601 — 28,678 Total current assets 3 85 100,842 53,475 (297 ) 154,108 Intercompany receivables, net 31,665 799,953 (690,761 ) (140,857 ) — — Property and equipment, net — — 82,901 12,371 — 95,272 Goodwill — — 1,683,121 176,788 — 1,859,909 Other intangible assets, net — — 592,095 19,962 — 612,057 Investment in subsidiaries 92,068 1,299,562 40,651 — (1,432,281 ) — Other assets — 5,911 23,153 5,864 — 34,928 Total assets $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Liabilities, redeemable non-controlling interest and stockholders' equity Current liabilities: Accounts payable $ — $ — $ 13,801 $ 2,273 — $ 16,074 Accrued expenses and other current liabilities — 27,208 60,760 9,890 — 97,858 Deferred revenue — — 295,208 60,925 (943 ) 355,190 Current portion of notes payable — 35,700 — — — 35,700 Current portion of capital lease obligations — — 6,690 — — 6,690 Deferred consideration, short-term — — 4,415 858 — 5,273 Total current liabilities — 62,908 380,874 73,946 (943 ) 516,785 Deferred revenue, long-term — — 77,649 11,551 — 89,200 Notes payable — 1,951,280 — — — 1,951,280 Capital lease obligations — — 512 — — 512 Deferred consideration — — 7,419 25 — 7,444 Other long-term liabilities — (745 ) 48,233 1,429 — 48,917 Total liabilities — 2,013,443 514,687 86,951 (943 ) 2,614,138 Redeemable non-controlling interest — — 17,753 — — 17,753 Equity 123,736 92,068 1,299,562 40,652 (1,431,635 ) 124,383 Total liabilities and equity $ 123,736 $ 2,105,511 $ 1,832,002 $ 127,603 $ (1,432,578 ) $ 2,756,274 Condensed Consolidating Balance Sheets December 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Current assets: Cash and cash equivalents $ 92 $ 2 $ 54,473 $ 11,926 $ — $ 66,493 Restricted cash — — 2,472 153 — 2,625 Accounts receivable — — 12,386 3,559 — 15,945 Prepaid domain name registry fees — — 28,291 25,514 — 53,805 Prepaid expenses & other current assets (12 ) 86 20,062 9,191 — 29,327 Total current assets 80 88 117,684 50,343 — 168,195 Intercompany receivables, net 33,637 606,834 (498,213 ) (142,258 ) — — Property and equipment, net — — 81,693 13,759 — 95,452 Goodwill — — 1,673,851 176,731 — 1,850,582 Other intangible assets, net — — 450,778 4,662 — 455,440 Investment in subsidiaries 49,288 1,355,013 37,200 — (1,441,501 ) — Other assets — 3,639 21,373 6,405 — 31,417 Total assets $ 83,005 $ 1,965,574 $ 1,884,366 $ 109,642 $ (1,441,501 ) $ 2,601,086 Liabilities, redeemable non-controlling interest and stockholders' equity: Current liabilities: Accounts payable $ — $ — $ 9,532 $ 1,526 $ — $ 11,058 Accrued expenses and other current liabilities — 24,509 75,819 8,151 — 108,479 Deferred revenue — — 309,395 52,545 — 361,940 Current portion of notes payable — 33,945 — — — 33,945 Current portion of capital lease obligations — — 7,630 — — 7,630 Deferred consideration, short-term — — 4,365 — — 4,365 Total current liabilities — 58,454 406,741 62,222 — 527,417 Deferred revenue, long-term — — 81,199 9,773 — 90,972 Notes payable — 1,858,300 — — — 1,858,300 Capital lease obligations — — 7,719 — — 7,719 Deferred consideration — — 3,551 — — 3,551 Other long-term liabilities — (468 ) 30,143 447 — 30,122 Total liabilities — 1,916,286 529,353 72,442 — 2,518,081 Equity 83,005 49,288 1,355,013 37,200 (1,441,501 ) 83,005 Total liabilities and equity $ 83,005 $ 1,965,574 $ 1,884,366 $ 109,642 $ (1,441,501 ) $ 2,601,086
Condensed Consolidated Statements of Operations and Comprehensive Loss	Condensed Consolidating Statements of Operations and Comprehensive Loss Year Ended December 31, 2015 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 628,266 $ 113,766 $ (717 ) $ 741,315 Cost of revenue — — 349,059 77,177 (1,201 ) 425,035 Gross profit — — 279,207 36,589 484 316,280 Operating expense: Sales & marketing — — 120,637 24,815 (33 ) 145,419 Engineering and development — — 23,019 3,688 — 26,707 General and administrative — 177 80,548 10,132 111 90,968 Total operating expense — 177 224,204 38,635 78 263,094 Income (loss) from operations — (177 ) 55,003 (2,046 ) 406 53,186 Interest expense and other income, net — 56,843 (3,554 ) (315 ) — 52,974 Income (loss) before income taxes and equity earnings of unconsolidated entities — (57,020 ) 58,557 (1,731 ) 406 212 Income tax expense (benefit) — 10,320 331 691 — 11,342 Income (loss) before equity earnings of unconsolidated entities — (67,340 ) 58,226 (2,422 ) 406 (11,130 ) Equity (income) loss of unconsolidated entities, net of tax 26,176 (41,164 ) 17,063 — 12,565 14,640 Net income (loss) (26,176 ) (26,176 ) 41,163 (2,422 ) (12,159 ) (25,770 ) Net loss attributable to non-controlling interest — — — — — — Net income (loss) attributable to Endurance $ (26,176 ) $ (26,176 ) $ 41,163 $ (2,422 ) $ (12,159 ) $ (25,770 ) Comprehensive income (loss): Foreign currency translation adjustments — — — (1,281 ) — (1,281 ) Unrealized gain on cash flow hedge — 80 — — — 80 Total comprehensive income (loss) $ (26,176 ) $ (26,096 ) $ 41,163 $ (3,703 ) $ (12,159 ) $ (26,971 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Year Ended December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 978,690 $ 133,274 $ (822 ) 1,111,142 Cost of revenue — — 496,267 88,753 (1,029 ) 583,991 Gross profit — — 482,423 44,521 207 527,151 Operating expense: Sales and marketing — — 235,988 67,556 (33 ) 303,511 Engineering and development — — 72,922 14,679 — 87,601 General and administrative — 242 128,337 14,516 — 143,095 Transaction expenses — — 32,284 — — 32,284 Total operating expense — 242 469,531 96,751 (33 ) 566,491 Income (loss) from operations — (242 ) 12,892 (52,230 ) 240 (39,340 ) Interest expense and other income —net — 149,512 (3,606 ) 4,544 — 150,450 Income (loss) before income taxes and equity earnings of unconsolidated entities — (149,754 ) 16,498 (56,774 ) 240 (189,790 ) Income tax expense (benefit) — (53,847 ) (55,953 ) (58 ) — (109,858 ) Income (loss) before equity earnings of unconsolidated entities — (95,907 ) 72,451 (56,716 ) 240 (79,932 ) Equity (income) loss of unconsolidated entities, net of tax 73,071 (22,837 ) 58,014 297 (107,248 ) 1,297 Net income (loss) $ (73,071 ) $ (73,070 ) $ 14,437 $ (57,013 ) $ 107,488 $ (81,229 ) Net income (loss) attributable to non-controlling interest — — (8,398 ) — — (8,398 ) Net income (loss) attributable to Endurance International Group Holdings, Inc. (73,071 ) (73,070 ) 22,835 (57,013 ) 107,488 (72,831 ) Comprehensive income (loss): Foreign currency translation adjustments — — — (597 ) — (597 ) Unrealized loss on cash flow hedge (1,351 ) — — — (1,351 ) Total comprehensive income (loss) $ (73,071 ) $ (74,421 ) $ 22,835 $ (57,610 ) $ 107,488 $ (74,779 ) Condensed Consolidating Statements of Operations and Comprehensive Loss Year Ended December 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Revenue $ — $ — $ 1,055,013 $ 128,350 $ (6,496 ) $ 1,176,867 Cost of revenue — — 515,065 94,082 (5,217 ) 603,930 Gross profit — — 539,948 34,268 (1,279 ) 572,937 Operating expense: Sales and marketing — — 256,902 20,561 (3 ) 277,460 Engineering and development — — 66,051 12,721 — 78,772 General and administrative — 207 155,339 9,054 (628 ) 163,972 Transaction expenses — — 773 — — 773 Impairment of goodwill 12,129 12,129 Total operating expense — 207 491,194 42,336 (631 ) 533,106 Income (loss) from operations — (207 ) 48,754 (8,068 ) (648 ) 39,831 Interest expense and other income —net — 156,144 1,338 (476 ) — 157,006 Income (loss) before income taxes and equity earnings of unconsolidated entities — (156,351 ) 47,416 (7,592 ) (648 ) (117,175 ) Income tax expense (benefit) — (57,504 ) 39,125 1,098 — (17,281 ) Income (loss) before equity earnings of unconsolidated entities — (98,847 ) 8,291 (8,690 ) (648 ) (99,894 ) Equity (income) loss of unconsolidated entities, net of tax 99,137 290 8,581 (17 ) (108,101 ) (110 ) Net income (loss) $ (99,137 ) $ (99,137 ) $ (290 ) $ (8,673 ) $ 107,453 $ (99,784 ) Net loss attributable to non-controlling interest — — 7,524 — — 7,524 Net income (loss) attributable to Endurance International Group Holdings, Inc. (99,137 ) (99,137 ) (7,814 ) (8,673 ) 107,453 (107,308 ) Comprehensive income (loss): Foreign currency translation adjustments — — — 3,091 — 3,091 Unrealized gain (loss) on cash flow hedge 34 — — — 34 Total comprehensive income (loss) $ (99,137 ) $ (99,103 ) $ (7,814 ) $ (5,582 ) $ 107,453 $ (104,183 )
Condensed Consolidated Statements of Cash Flows	Condensed Consolidating Statements of Cash Flows Year Ended December 31, 2015 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ 2 $ (50,147 ) $ 220,468 6,905 — $ 177,228 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (92,376 ) (5,419 ) — (97,795 ) Purchases of property and equipment — — (28,058 ) (3,185 ) — (31,243 ) Cash paid for minority investments — — (8,475 ) — — (8,475 ) Proceeds from sale of property and equipment — — 51 42 — 93 Proceeds from note receivable — — 3,454 — — 3,454 Proceeds from sale of assets — — 191 — — 191 Purchases of intangible assets — — (76 ) — — (76 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — (296 ) 346 — 50 Net cash used in investing activities — — (125,585 ) (8,216 ) — (133,801 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 147,000 — — — 147,000 Repayment of notes payable and revolver — (140,500 ) — — — (140,500 ) Payment of financing costs — — — — — — Payment of deferred consideration — — (14,503 ) (488 ) — (14,991 ) Payment of redeemable non-controlling interest liability — — (30,543 ) — — (30,543 ) Principal payments on capital lease obligations — — (4,822 ) — — (4,822 ) Proceeds from exercise of stock options 2,224 — — — — 2,224 Intercompany loans and investments (2,215 ) 39,367 (42,431 ) 5,279 — — Net cash provided by (used in) financing activities 9 45,867 (92,299 ) 4,791 — (41,632 ) Net effect of exchange rate on cash and cash equivalents — — — (1,144 ) — (1,144 ) Net increase (decrease) in cash and cash equivalents 11 (4,280 ) 2,584 2,336 — 651 Cash and cash equivalents: Beginning of period 1 4,347 18,702 9,329 — 32,379 End of period $ 12 $ 67 $ 21,286 $ 11,665 $ — $ 33,030 Condensed Consolidating Statements of Cash Flows Year Ended December 31, 2016 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ (71,204 ) $ 256,461 (30,296 ) $ 154,961 Cash flows from investing activities: Businesses acquired in purchase transaction, net of cash acquired — — (889,634 ) — — (889,634 ) Purchases of property and equipment — — (32,528 ) (4,731 ) — (37,259 ) Cash paid for minority investments — — (5,600 ) — — (5,600 ) Proceeds from sale of property and equipment — — 674 2 — 676 Purchases of intangible assets — — (7 ) (20 ) — (27 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — (347 ) (210 ) — (557 ) Net cash used in investing activities — — (927,442 ) (4,959 ) — (932,401 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 1,110,678 — — — 1,110,678 Repayment of notes payable and revolver — (176,700 ) — — — (176,700 ) Payment of financing costs — (52,561 ) — — — (52,561 ) Payment of deferred consideration — — (50,375 ) (669 ) — (51,044 ) Payment of redeemable non-controlling interest liability — — (33,425 ) — — (33,425 ) Principal payments on capital lease obligations — — (5,892 ) — — (5,892 ) Proceeds from exercise of stock options 2,564 — — — — 2,564 Capital investments from minority partner — — — 2,776 — 2,776 Intercompany loans and investments (2,573 ) (810,276 ) 778,421 34,428 — — Net cash provided by (used in) financing activities (9 ) 71,141 688,729 36,535 — 796,396 Net effect of exchange rate on cash and cash equivalents — — — 1,610 — 1,610 Net increase (decrease) in cash and cash equivalents (9 ) (63 ) 17,748 2,890 — 20,566 Cash and cash equivalents: Beginning of period 12 67 21,286 11,665 33,030 End of period $ 3 $ 4 $ 39,034 $ 14,555 $ — $ 53,596 Condensed Consolidating Statements of Cash Flows Year Ended December 31, 2017 (in thousands) Parent Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net cash provided by (used in) operating activities $ 12 $ (82,189 ) $ 284,912 (1,462 ) $ 201,273 Cash flows from investing activities: — — — — — Purchases of property and equipment — — (38,731 ) (4,331 ) — (43,062 ) Cash paid for minority investments — — — — — — Proceeds from sale of assets — — 530 — — 530 Purchases of intangible assets — — (1,932 ) (34 ) — (1,966 ) Net (deposits) and withdrawals of principal balances in restricted cash accounts — — 148 529 — 677 Net cash used in investing activities — — (39,985 ) (3,836 ) — (43,821 ) Cash flows from financing activities: Proceeds from issuance of notes payable and draws on revolver — 1,693,007 — — — 1,693,007 Repayment of notes payable and revolver — (1,797,634 ) — — — (1,797,634 ) Payment of financing costs — (6,304 ) — — — (6,304 ) Payment of deferred consideration — — (4,550 ) (883 ) — (5,433 ) Payment of redeemable non-controlling interest liability — — (25,000 ) — — (25,000 ) Principal payments on capital lease obligations — — (7,390 ) — — (7,390 ) Proceeds from exercise of stock options 2,049 — — — — 2,049 Capital investments from minority partner — — — — — — Intercompany loans and investments (1,972 ) 193,118 (192,548 ) 1,402 — — Net cash provided by (used in) financing activities 77 82,187 (229,488 ) 519 — (146,705 ) Net effect of exchange rate on cash and cash equivalents — — — 2,150 — 2,150 Net increase (decrease) in cash and cash equivalents 89 (2 ) 15,439 (2,629 ) — 12,897 Cash and cash equivalents: Beginning of period 3 4 39,034 14,555 53,596 End of period $ 92 $ 2 $ 54,473 $ 11,926 $ — $ 66,493

Summary of Significant Accoun49

Summary of Significant Accounting Policies - Additional Information (Details)	Oct. 31, 2017USD ($)	Dec. 31, 2017USD ($)Segment	Dec. 31, 2017USD ($)reporting_unit	Sep. 30, 2017Segment	Dec. 31, 2016USD ($)Segment	Dec. 31, 2015USD ($)	Jul. 27, 2016USD ($)	Apr. 08, 2016	Feb. 09, 2016USD ($)	Dec. 31, 2014USD ($)
Accounting Policies [Line Items]
Number of reportable segments | Segment		3		2	2
Capitalized computer software			$ 10,200,000		$ 11,800,000	$ 5,500,000
Voting interest		20.00%	20.00%
Number of reporting units | reporting_unit			10
Discount rate			10.00%
Impairment of goodwill		$ 12,100,000	$ 12,129,000		0	0
Goodwill		1,850,582,000	1,850,582,000		1,859,909,000	1,207,255,000
Impairment of other long-lived assets(4)			$ 18,731,000		9,039,000	0
Contract service period			36 months
Reserves for refunds and chargebacks		500,000	$ 500,000		600,000
Deferred revenue expected to be refunded		1,800,000	$ 1,800,000		2,100,000
Percentage of deferred revenue refunded within same fiscal month			83.00%
Percentage of deferred revenue refunded within 45 days			96.00%
Sales and marketing costs			$ 277,460,000		303,511,000	145,419,000
Foreign currency transaction gains (losses)			800,000		1,800,000	1,900,000
Unrecognized tax benefits		1,129,000	1,129,000		0	0
Penalties and interest expense			0		0	0
Accumulated deficit		$ (847,501,000)	$ (847,501,000)		(740,193,000)
Fortifico Limited
Accounting Policies [Line Items]
Impairment charges on investments					$ 4,700,000
Ownership interest					33.00%			33.00%
Minimum
Accounting Policies [Line Items]
Percentage of voting interest		20.00%	20.00%
Voting interest		20.00%	20.00%
Maximum
Accounting Policies [Line Items]
Percentage of voting interest		50.00%	50.00%
Voting interest		50.00%	50.00%
Developed technology
Accounting Policies [Line Items]
Estimated useful life			7 years		7 years
In-process research and development
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)					$ 2,200,000	0
Domain Name Intangible Assets
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)			$ 13,800,000
Impairment of intangible assets (excluding goodwill)			18,700,000
Developed technology and customer relationships
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)			$ 4,900,000
Constant Contact, Inc.
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)					2,000,000
Constant Contact, Inc. | Developed technology
Accounting Policies [Line Items]
In-process research and development capitalized									$ 83,000,000
Webzai Ltd
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)					4,900,000
Webzai Ltd | Software Development
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)					500,000
Webzai Ltd | Developed technology
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)					4,400,000
Impairment of intangible assets (excluding goodwill)					4,400,000
Webzai Ltd | In-process research and development
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)					1,400,000
Impairment of intangible assets (excluding goodwill)					1,400,000
In-process research and development capitalized						3,200,000				$ 4,600,000
Estimated useful life			4 years
AppMachine
Accounting Policies [Line Items]
Ownership interest										40.00%
Goodwill							$ 21,500,000
AppMachine | Developed technology
Accounting Policies [Line Items]
In-process research and development capitalized					900,000		1,700,000
Estimated useful life			4 years
AppMachine | In-process research and development
Accounting Policies [Line Items]
Impairment of other long-lived assets(4)					800,000
Impairment of intangible assets (excluding goodwill)					800,000
In-process research and development capitalized					1,700,000		$ 1,700,000
Domain
Accounting Policies [Line Items]
Impairment of goodwill			$ 12,129,000
Goodwill		$ 29,858,000	29,858,000		0	0
Impairment of other long-lived assets(4)					0	0
Web presence
Accounting Policies [Line Items]
Number of reportable segments | Segment		2
Impairment of goodwill			0
Goodwill		$ 1,216,419,000	1,216,419,000		1,255,604,000	1,207,255,000
Impairment of other long-lived assets(4)					9,039,000	0
Accounting Standards Update 2016-09, Excess Tax Benefit Component [Member] | ASU 2016-09
Accounting Policies [Line Items]
Tax adjustments			900,000		900,000
Aggregate stock-based compensation expense			$ 900,000		900,000
Amount of net operating loss carry-forwards available to offset future U.S. federal taxable income					1,500,000	1,500,000
Amount of net operating loss carry-forwards available to offset future state taxable income					$ 700,000	$ 700,000
Reporting Units With Goodwill Allocated
Accounting Policies [Line Items]
Number of reporting units | reporting_unit			7
Reporting Units With No Goodwill Allocated
Accounting Policies [Line Items]
Number of reporting units | reporting_unit			3
Domain Monetization | Domain
Accounting Policies [Line Items]
Impairment of goodwill	$ 12,100,000
Reporting Units With Goodwill And No Impairment
Accounting Policies [Line Items]
Number of reporting units | reporting_unit			6
Reporting Units Whose Fair Value Exceeds Carrying Value By 20%
Accounting Policies [Line Items]
Goodwill		1,820,700,000	$ 1,820,700,000
Fair value in excess of carrying value			20.00%
domain.com | Domain
Accounting Policies [Line Items]
Goodwill		29,900,000	$ 29,900,000
Fair value in excess of carrying value			6.00%
Backup Reporting Unit | Web presence
Accounting Policies [Line Items]
Goodwill		2,300,000	$ 2,300,000
Pro Forma | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Accounting Policies [Line Items]
Accumulated deficit		67,000,000	67,000,000
Deferred customer acquisition costs		83,000,000	83,000,000
Deferred domain registration costs		6,000,000	6,000,000
Deferred revenue		$ 22,000,000	$ 22,000,000

Summary of Significant Accoun50

Summary of Significant Accounting Policies - Summary of Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2017
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	35 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	2 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	3 years
Computers and office equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Leasehold improvements	Shorter of useful life or remaining term of the lease

Summary of Significant Accoun51

Summary of Significant Accounting Policies - Computation of Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Net loss attributable to Endurance International Group Holdings, Inc.	$ 7,473	$ (40,264)	$ (39,129)	$ (35,388)	$ (34,865)	$ (31,737)	$ (28,040)	$ 21,811	$ (107,308)	$ (72,831)	$ (25,770)
Net loss per share attributable to Endurance International Group Holdings, Inc.—basic and diluted (in usd per share)									$ (0.78)	$ (0.55)	$ (0.20)
Weighted average number of common shares used in computing net loss per share attributable to Endurance International Group Holdings, Inc: Basic and diluted (in shares)									137,322,201	133,415,732	131,340,557

Summary of Significant Accoun52

Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	19,696,635	18,400,232	9,742,938
Restricted Stock Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	8,967,840	8,019,241	3,019,349
Options Held
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	10,728,795	10,380,991	6,723,589

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jul. 07, 2017	Jul. 27, 2016	Jul. 13, 2016	May 16, 2016	Feb. 09, 2016	Jan. 06, 2016	Dec. 02, 2015	Nov. 02, 2015	Oct. 30, 2015	Sep. 21, 2015	Jun. 25, 2015	May 26, 2015	Jul. 31, 2016	Dec. 31, 2014	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 14, 2016	Jul. 12, 2016	Aug. 31, 2014
Business Acquisition [Line Items]
Goodwill																$ 1,850,582	$ 1,859,909	$ 1,207,255
Interest expense																157,142	152,888	58,828
Investments																15,267	15,857
Loss of unconsolidated entities																$ 110	(1,297)	(14,640)
Verio
Business Acquisition [Line Items]
Business acquisition, estimated aggregate purchase price												$ 13,000
Business acquisition, cash paid												10,500					2,500
Remaining consideration												2,500
Goodwill												1,200
Deferred revenue												1,400
Verio | Subscriber relationships
Business Acquisition [Line Items]
Long-lived intangible assets												13,100
Verio | Trade-names
Business Acquisition [Line Items]
Long-lived intangible assets												$ 100
World Wide Web Hosting, LLC
Business Acquisition [Line Items]
Business acquisition, estimated aggregate purchase price											$ 34,900
Business acquisition, cash paid											18,400						4,600
Remaining consideration											4,600
Goodwill											23,300
Deferred revenue											2,500
Cash payable											23,000
Contribution of investment interest											$ 11,900
Ownership interest											40.00%
Gain of unconsolidated entities											$ 5,400
Prepaid expense and other current assets											1,200
World Wide Web Hosting, LLC | Subscriber relationships
Business Acquisition [Line Items]
Long-lived intangible assets											11,000
World Wide Web Hosting, LLC | Trade-names
Business Acquisition [Line Items]
Long-lived intangible assets											$ 1,900
Ace Data Centers Inc
Business Acquisition [Line Items]
Business acquisition, estimated aggregate purchase price										$ 74,000
Business acquisition, cash paid										44,400							31,400
Remaining consideration										31,500
Goodwill										62,200
Prepaid expense and other current assets										$ 200
Working capital adjustment determination period from closing date of acquisition										75 days
Additional consideration							$ 700
Interest expense																		700
Net present value of remaining consideration							$ 28,900											$ 29,600
Property and equipment										$ 12,100
Other liabilities										600
Ace Data Centers Inc | Developed technology
Business Acquisition [Line Items]
Long-lived intangible assets										$ 100
Ecommerce, LLC
Business Acquisition [Line Items]
Business acquisition, estimated aggregate purchase price								$ 28,000
Business acquisition, cash paid								23,800
Remaining consideration								4,200
Goodwill								16,700
Deferred revenue								2,600
Ecommerce, LLC | Subscriber relationships
Business Acquisition [Line Items]
Long-lived intangible assets								9,400
Ecommerce, LLC | Trade-names
Business Acquisition [Line Items]
Long-lived intangible assets								100
Ecommerce, LLC | Intellectual property
Business Acquisition [Line Items]
Long-lived intangible assets								$ 4,400
WZ (UK) Ltd.
Business Acquisition [Line Items]
Business acquisition, estimated aggregate purchase price	$ 25,000		$ 18,000	$ 15,400		$ 22,200							$ 25,000
Goodwill						21,600
Deferred revenue						$ 3,300
Ownership interest			86.40%	77.50%		57.50%													86.40%	76.40%	49.00%
Property and equipment						$ 300
Investments																					$ 3,900
Redeemable noncontrolling interest, equity, fair value						10,800
Loss of unconsolidated entities						11,400
Negative net working capital						1,300
Exercised call option						30,000
Percentage of additional stake acquired			76.40%	20.00%															10.00%
Noncontrolling interest, ownership percentage																			13.60%
WZ (UK) Ltd. | Subscriber relationships
Business Acquisition [Line Items]
Long-lived intangible assets						$ 4,900
Constant Contact, Inc.
Business Acquisition [Line Items]
Business acquisition, estimated aggregate purchase price					$ 1,100,000				$ 1,100,000
Deferred revenue					25,200
Property and equipment					39,600
Issuance of common stock (in USD per share)									$ 32
Working capital					184,200
Goodwill related to acquisitions					604,300
Deferred tax liabilities					125,100
Acquisition related costs															$ 31,100
Constant Contact, Inc. | Subscriber relationships
Business Acquisition [Line Items]
Long-lived intangible assets					263,000
Constant Contact, Inc. | Trade-names
Business Acquisition [Line Items]
Long-lived intangible assets					52,000
Constant Contact, Inc. | Developed technology
Business Acquisition [Line Items]
Long-lived intangible assets					$ 83,000
AppMachine
Business Acquisition [Line Items]
Business acquisition, estimated aggregate purchase price		$ 22,500
Business acquisition, cash paid		5,500
Goodwill		21,500
Deferred revenue		200
Ownership interest														40.00%
Interest expense		1,500
Net present value of remaining consideration		11,500
Property and equipment		600
Other liabilities		$ 100
Investments														$ 15,200
Percentage of additional stake acquired		60.00%												60.00%
Percentage of stock ownership		100.00%
Working capital		$ 400
Periodic payment on equity method investment, percentage														20.00%
Deferred consideration		17,000
Acquisition related costs		$ 4,000
Acquisition payment period		4 years
Recognized loss due to fair value of investment		$ 4,900
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination		25,700
Deferred consideration payable		13,000
Carrying value of investment		13,600
AppMachine | Subscriber relationships
Business Acquisition [Line Items]
Long-lived intangible assets		100
AppMachine | Developed technology
Business Acquisition [Line Items]
Long-lived intangible assets		1,700															900
AppMachine | In-process research and development
Business Acquisition [Line Items]
Long-lived intangible assets		$ 1,700															$ 1,700

Acquisitions - Summary of Defer

Acquisitions - Summary of Deferred Consideration Related to Acquisition (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Short- term	$ 4,365	$ 5,273
Long- term	3,551	7,444
Mojoness, Inc. (Acquired in 2012)
Business Acquisition [Line Items]
Short- term		818
Long- term		0
Verio (Acquired in 2015)
Business Acquisition [Line Items]
Short- term		50
Long- term		0
Social Booster (Acquired in 2016)
Business Acquisition [Line Items]
Short- term		40
Long- term		25
AppMachine (Acquired in 2016)
Business Acquisition [Line Items]
Short- term	4,365	4,365
Long- term	$ 3,551	$ 7,419

Derivatives And Hedging Activ55

Derivatives And Hedging Activities - Additional Information (Detail)	Dec. 09, 2015	Dec. 31, 2017USD ($)agreement	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cap agreement period	3 years
Gain on interest rate cash flow hedge ineffectiveness		$ 0
Interest expense		157,142,000	$ 152,888,000	$ 58,828,000
Unrealized gain (loss) on cash flow hedge, net of taxes of $0, $46, and ($792) for the years ended December 31, 2014, 2015 and 2016		(34,000)	1,351,000	$ (80,000)
AOCI tax, attributable to parent		0	800,000
Reclassification out of Accumulated Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gain to be reclassified as increase to interest expense in the next twelve months		1,900,000
Cash Flow Hedging | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Recognized gain		$ 1,400,000
Cash Flow Hedging | Interest Rate Cap
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate cap agreements | agreement		1
Notional amount outstanding		$ 500,000,000
Interest expense		600,000	0
Fair Value, Measurements, Recurring
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate cap (included in other assets)		$ 452,000	$ 979,000

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment of contingent earn-out related to acquisition	$ 818	$ 668
Mojoness Inc
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment of contingent earn-out related to acquisition	$ 800

Fair Value Measurements - Basis

Fair Value Measurements - Basis of Fair Value Measurements (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets:
Interest rate cap (included in other assets)	$ 452	$ 979
Total financial assets	452	979
Financial liabilities:
Contingent earn-out consideration		818
Total financial liabilities		818
Quoted Prices in Active Markets for Identical Items (Level 1)
Financial assets:
Interest rate cap (included in other assets)	0	0
Total financial assets	0	0
Financial liabilities:
Contingent earn-out consideration		0
Total financial liabilities		0
Significant Other Observable Inputs (Level 2)
Financial assets:
Interest rate cap (included in other assets)	452	979
Total financial assets	452	979
Financial liabilities:
Contingent earn-out consideration		0
Total financial liabilities		0
Significant Unobservable Inputs (Level 3)
Financial assets:
Interest rate cap (included in other assets)	0	0
Total financial assets	$ 0	0
Financial liabilities:
Contingent earn-out consideration		818
Total financial liabilities		$ 818

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in the Financial Liabilities Measured on a Recurring Basis Using Level 3 Inputs (Detail) - Significant Unobservable Inputs (Level 3) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Financial liabilities measured using Level 3 inputs , Opening balance	$ 818	$ 1,469
Payment of contingent earn-out related to 22012 and 2014 acquisitions	(818)	(668)
Change in fair value of contingent earn-outs	0	17
Financial liabilities measured using Level 3 inputs, Ending balance	$ 0	$ 818

Property and Equipment - Compon

Property and Equipment - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 286,603	$ 240,355
Less accumulated depreciation	(191,151)	(145,083)
Property and equipment—net	95,452	95,272
Land
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	790	790
Building
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	5,037	5,517
Software
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	82,618	52,130
Computers and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	153,273	143,091
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	18,825	10,892
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	22,260	21,244
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment—at cost	$ 3,800	$ 6,691

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 55,185	$ 60,360	$ 34,010
Minimum
Property, Plant and Equipment [Line Items]
Term of lease	24 months	24 months
Maximum
Property, Plant and Equipment [Line Items]
Term of lease	39 months	39 months
Constant Contact, Inc. | Engineering And Development
Property, Plant and Equipment [Line Items]
Impaired software		$ 2,000
Webzai Ltd | Engineering And Development
Property, Plant and Equipment [Line Items]
Impaired software		$ 500

Property and Equipment - Summar

Property and Equipment - Summary of Software Assets under Capital Lease (Detail) - Software - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Software	$ 17,256	$ 21,499
Less accumulated depreciation	(2,265)	(14,750)
Assets under capital lease—net	$ 14,991	$ 6,749

Property and Equipment - Summ62

Property and Equipment - Summary of Future Minimum Lease Payments under Capital Lease (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
2,018	$ 8,384
2,019	7,977
Total minimum lease payments	16,361
Less amount representing interest	(1,012)
Present value of minimum lease payments (capital lease obligation)	15,349
Current portion	7,630	$ 6,690
Long-term portion	$ 7,719	$ 512

Goodwill and Other Intangible63

Goodwill and Other Intangible Assets - Changes in Goodwill Balances (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 1,859,909,000	$ 1,207,255,000
Foreign translation impact		2,802,000	(648,000)
Reallocation of goodwill		0
Impairment of goodwill	$ (12,100,000)	(12,129,000)	0	$ 0
Goodwill, ending balance	1,850,582,000	1,850,582,000	1,859,909,000	1,207,255,000
Web presence
Goodwill [Roll Forward]
Goodwill, beginning balance		1,255,604,000	1,207,255,000
Foreign translation impact		2,802,000	(648,000)
Reallocation of goodwill		(41,987,000)
Impairment of goodwill		0
Goodwill, ending balance	1,216,419,000	1,216,419,000	1,255,604,000	1,207,255,000
Email marketing
Goodwill [Roll Forward]
Goodwill, beginning balance		604,305,000	0
Foreign translation impact		0	0
Reallocation of goodwill		0
Impairment of goodwill		0
Goodwill, ending balance	604,305,000	604,305,000	604,305,000	0
Domain
Goodwill [Roll Forward]
Goodwill, beginning balance		0	0
Foreign translation impact			0
Reallocation of goodwill		41,987,000
Impairment of goodwill		(12,129,000)
Goodwill, ending balance	$ 29,858,000	$ 29,858,000	0	$ 0
Goodwill related to 2015 acquisitions
Goodwill [Roll Forward]
Goodwill related to acquisitions			5,978,000
Goodwill related to 2015 acquisitions | Web presence
Goodwill [Roll Forward]
Goodwill related to acquisitions			5,978,000
Goodwill related to 2015 acquisitions | Email marketing
Goodwill [Roll Forward]
Goodwill related to acquisitions			0
Goodwill related to 2015 acquisitions | Domain
Goodwill [Roll Forward]
Goodwill related to acquisitions			0
Goodwill related to 2016 acquisitions
Goodwill [Roll Forward]
Goodwill related to acquisitions			647,324,000
Goodwill related to 2016 acquisitions | Web presence
Goodwill [Roll Forward]
Goodwill related to acquisitions			43,019,000
Goodwill related to 2016 acquisitions | Email marketing
Goodwill [Roll Forward]
Goodwill related to acquisitions			604,305,000
Goodwill related to 2016 acquisitions | Domain
Goodwill [Roll Forward]
Goodwill related to acquisitions			$ 0

Goodwill and Other Intangible64

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 12,100,000	$ 12,129,000	$ 0	$ 0
Amortization of other intangible assets		140,354,000	143,562,000	$ 91,057,000
Domain Name Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets (excluding goodwill)		$ 18,700,000
Webzai Ltd | In-process research and development
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets (excluding goodwill)			1,400,000
Webzai Ltd | Developed technology
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets (excluding goodwill)			4,400,000
AppMachine | In-process research and development
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets (excluding goodwill)			$ 800,000

Goodwill and Other Intangible65

Goodwill and Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,144,782	$ 1,141,824
Accumulated Amortization	689,342	529,767
Net Carrying Amount	455,440	612,057
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	285,911	284,005
Accumulated Amortization	149,514	111,348
Net Carrying Amount	$ 136,397	$ 172,657
Weighted Average Useful Life	7 years	7 years
Subscriber relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 659,732	$ 659,662
Accumulated Amortization	431,938	345,070
Net Carrying Amount	$ 227,794	$ 314,592
Weighted Average Useful Life	7 years	7 years
Trade-names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 134,054	$ 133,805
Accumulated Amortization	73,019	57,789
Net Carrying Amount	$ 61,035	$ 76,016
Weighted Average Useful Life	8 years	8 years
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 34,313	$ 34,084
Accumulated Amortization	27,336	10,270
Net Carrying Amount	$ 6,977	$ 23,814
Weighted Average Useful Life	5 years	13 years
Leasehold interests
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 314	$ 314
Accumulated Amortization	314	314
Net Carrying Amount	$ 0	$ 0
Weighted Average Useful Life	1 year	1 year
Domain names available for sale
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 30,458	$ 29,954
Accumulated Amortization	7,221	4,976
Net Carrying Amount	$ 23,237	$ 24,978
Weighted Average Useful Life	Indefinite	Indefinite

Goodwill and Other Intangible66

Goodwill and Other Intangible Assets - Summary of Expected Future Amortization of Other Intangible Assets (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 100,637
2,019	82,705
2,020	69,792
2,021	60,676
2,022	36,232
Thereafter	82,161
Total	$ 432,203

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 25, 2015	Jun. 24, 2015	Oct. 31, 2013	Dec. 31, 2014	May 31, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 27, 2016	Apr. 08, 2016	Mar. 03, 2016	Jan. 06, 2016	Dec. 21, 2015	Jul. 02, 2015	Aug. 31, 2014	Jul. 31, 2012	Jan. 31, 2012
Schedule of Cost-method Investments [Line Items]
Investments						$ 15,267	$ 15,857
Accounts payable						11,058	16,074
Proceeds from note receivable						0	0	$ 3,454
Loss of unconsolidated entities						$ (110)	$ 1,297	14,640
Voting interest						20.00%
Proportionate share exceed of the company's consolidated assets or income							10.00%
Bluezone Labs, LLC
Schedule of Cost-method Investments [Line Items]
Investments																	$ 300
Ownership interest																	25.00%
Purchase of products and services						$ 1,700	$ 1,600
Accounts payable						100	100
Prepaid expense						700	$ 0
World Wide Web Hosting, LLC
Schedule of Cost-method Investments [Line Items]
Investments																$ 10,000
Ownership interest	40.00%		40.00%													50.00%
Ownership interest percentage			20.00%
Percentage of companies capital stock sold			10.00%
Contribution of investment interest	$ 11,900
Gain of unconsolidated entities								5,400
Proceeds from note receivable		$ 3,500
WZ UK Ltd.
Schedule of Cost-method Investments [Line Items]
Investments															$ 3,900
Ownership interest												57.50%			49.00%
Loss of unconsolidated entities								$ 13,900
Increase (decrease) in investment													$ 1,100	$ 7,400
AppMachine
Schedule of Cost-method Investments [Line Items]
Investments				$ 15,200
Ownership interest				40.00%					100.00%
Remaining percentage of acquisition				60.00%
Periodic payment on equity method investment, percentage				20.00%
Periodic payment on equity method investment determination percentage				60.00%
Web and Money Management Solution
Schedule of Cost-method Investments [Line Items]
Interest note receivable											$ 600
Impairment on the remaining investment						$ 600
Fortifico Limited
Schedule of Cost-method Investments [Line Items]
Investments										$ 5,000
Ownership interest							33.00%			33.00%
Impairment on the remaining investment							$ 4,700
Minimum
Schedule of Cost-method Investments [Line Items]
Voting interest						20.00%
Minimum | WZ UK Ltd.
Schedule of Cost-method Investments [Line Items]
Proportionate share of company's income from continuing operations						20.00%
Maximum
Schedule of Cost-method Investments [Line Items]
Voting interest						50.00%
Automattic
Schedule of Cost-method Investments [Line Items]
Investment made on asset					$ 15,000
Percentage of outstanding shares invested					5.00%

Notes Payable - Schedule of Lon

Notes Payable - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Total Notes Payable	$ 1,892,245	$ 1,986,980
Current portion of Notes Payable	33,945	35,700
Notes Payable - long-term	1,858,300	1,951,280
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Total Notes Payable	1,563,197	0
Current portion of Notes Payable	33,945
Notes Payable - long-term	1,529,252
2013 First Lien Term Loan
Long-Term Debt [Line Items]
Total Notes Payable	0	985,640
Current portion of Notes Payable	0	21,000
Notes Payable - long-term	0	964,640
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Total Notes Payable	0	674,860
Current portion of Notes Payable	0	14,700
Notes Payable - long-term	0	660,160
Senior Notes
Long-Term Debt [Line Items]
Total Notes Payable	329,048	326,480
Current portion of Notes Payable	0	0
Notes Payable - long-term	329,048	326,480
Revolving Credit Facilities
Long-Term Debt [Line Items]
Total Notes Payable	$ 0	$ 0

Notes Payable - Additional Info

Notes Payable - Additional Information (Detail)	Jun. 14, 2017USD ($)	Sep. 30, 2016USD ($)	Feb. 28, 2016	Feb. 09, 2016USD ($)	Feb. 08, 2016	Nov. 30, 2013USD ($)	Dec. 31, 2017USD ($)repaymentprepayment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jan. 30, 2017USD ($)	Feb. 29, 2016USD ($)
Long-Term Debt [Line Items]
Mandatory repayments on term loan							$ 1,797,634,000	$ 55,200,000	$ 10,500,000
Non-refundable fee—unused facility							0.50%	0.50%	0.50%
Interest expense, net (including impact of amortization of deferred financing costs and original issuance discount)							$ 157,142,000	$ 152,888,000	$ 58,828,000
Interest expense and service fees							138,041,000	140,470,000	56,760,000
Financing costs expensed							5,487,000	0	$ 0
Revolving Credit Facility
Long-Term Debt [Line Items]
Aggregate principal amount not to exceed				$ 165,000,000		$ 125,000,000	165,000,000				$ 165,000,000
Non-refundable fee—unused facility						0.50%
Line of credit facility, commitment fee percent				0.50%
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
LIBOR based interest rate reduced			5.00%
Debt instrument reference rate			4.00%
Greater of the LIBOR rate			1.00%
Adjusted LIBOR rate			2.00%
Mandatory repayments on term loan		$ 3,700,000					$ 3,700,000	14,700,000
Extinguishment of debt	$ 716,600,000
Principal on incremental first lien				$ 735,000,000
Debt instrument issue price				97.00%
Financing fee				1.00%
Debt amortization rate				0.50%
Aggregate principal amount not to exceed											735,000,000
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Original loan balance	$ 1,697,300,000
Debt instrument issue price	99.75%
LIBOR based interest rate reduced	4.00%
Debt instrument reference rate	3.00%
Greater of the LIBOR rate	1.00%
Adjusted LIBOR rate	2.00%
Number of mandatory repayments | repayment							3
Mandatory repayments on term loan							$ 8,500,000
Number of voluntary prepayments | prepayment							3
Voluntary prepayments							$ 66,000,000
Capitalized original issue discounts							4,200,000
Deferred financing costs							900,000
Interest expense and service fees							1,000,000
2013 First Lien Term Loan
Long-Term Debt [Line Items]
LIBOR based interest rate reduced					4.00%
Debt instrument reference rate					3.00%
Greater of the LIBOR rate			5.48%	5.23%	1.00%
Adjusted LIBOR rate			4.48%	4.23%	2.00%
Mandatory repayments on term loan							2,600,000	10,500,000
Voluntary prepayments							$ 2,600,000	$ 30,000,000
Original loan balance						$ 1,050,000,000
Extinguishment of debt	$ 980,600,000
LIBOR Based Interest Rate Loan | Revolving Credit Facility
Long-Term Debt [Line Items]
Basis spread on variable rate				0.50%		6.25%
Debt instrument reference rate				4.00%
Greater of the LIBOR rate				3.00%
Reference Rate Loan | Revolving Credit Facility
Long-Term Debt [Line Items]
Percentage points added to federal funds effective rate						0.50%
Alternate Base Rate Loan | Revolving Credit Facility
Long-Term Debt [Line Items]
Debt instrument reference rate						5.25%
Adjusted LIBOR rate						2.25%
Debt instrument basis spread on LIBOR rate						1.50%
Senior Notes
Long-Term Debt [Line Items]
Original loan balance											350,000,000
Debt instrument issue price				98.065%			101.00%
Senior notes				$ 350,000,000						$ 350,000,000	$ 350,000,000
Interest rate—Notes							10.875%	10.875%	0.00%
London Interbank Offered Rate (LIBOR) | Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Basis spread on variable rate			1.00%
London Interbank Offered Rate (LIBOR) | 2017 First Lien Term Loan
Long-Term Debt [Line Items]
Basis spread on variable rate	1.00%
London Interbank Offered Rate (LIBOR) | 2013 First Lien Term Loan
Long-Term Debt [Line Items]
Basis spread on variable rate					1.00%
Interest rate—Notes					5.00%
London Interbank Offered Rate (LIBOR) | LIBOR Based Interest Rate Loan | Revolving Credit Facility
Long-Term Debt [Line Items]
Greater of the LIBOR rate				1.00%
Federal Funds Effective Swap Rate | Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Basis spread on variable rate			0.50%
Federal Funds Effective Swap Rate | 2017 First Lien Term Loan
Long-Term Debt [Line Items]
Basis spread on variable rate	0.50%
Federal Funds Effective Swap Rate | 2013 First Lien Term Loan
Long-Term Debt [Line Items]
Basis spread on variable rate					0.50%

Notes Payable - Schedule of Fir

Notes Payable - Schedule of First Lien Term Loan (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Notes payable, gross	$ 1,605,792
Unamortized deferred financing costs	(25,811)	$ (25,853)
Unamortized original issue discount	(37,736)	(43,342)
Net notes payable	1,892,245	1,986,980
Current portion of Notes Payable	33,945	35,700
Notes Payable - long-term	1,858,300	1,951,280
2017 First Lien Term Loan
Long-Term Debt [Line Items]
Notes payable, gross	1,605,792
Unamortized deferred financing costs	(22,456)
Unamortized original issue discount	(20,139)
Net notes payable	1,563,197	0
Current portion of Notes Payable	33,945
Notes Payable - long-term	1,529,252
2013 First Lien Term Loan
Long-Term Debt [Line Items]
Notes payable, gross	0	985,875
Unamortized deferred financing costs	0	(235)
Net notes payable	0	985,640
Current portion of Notes Payable	0	21,000
Notes Payable - long-term	$ 0	$ 964,640

Notes Payable - Schedule of Inc

Notes Payable - Schedule of Incremental First Lien Term Loan (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Notes payable, gross	$ 1,605,792
Unamortized deferred financing costs	(25,811)	$ (25,853)
Unamortized original issue discount	(37,736)	(43,342)
Net notes payable	1,892,245	1,986,980
Current portion of Notes Payable	33,945	35,700
Notes Payable - long-term	1,858,300	1,951,280
Incremental First Lien Term Loan
Long-Term Debt [Line Items]
Notes payable, gross	0	720,300
Unamortized deferred financing costs	0	(25,869)
Unamortized original issue discount	0	(19,571)
Net notes payable	0	674,860
Current portion of Notes Payable	0	14,700
Notes Payable - long-term	$ 0	$ 660,160

Notes Payable - Schedule of Sen

Notes Payable - Schedule of Senior Notes (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Long-Term Debt [Line Items]
Notes payable, gross	$ 1,605,792
Unamortized deferred financing costs	(25,811)	$ (25,853)
Unamortized original issue discount	(37,736)	(43,342)
Net notes payable	1,892,245	1,986,980
Current portion of Notes Payable	33,945	35,700
Notes Payable - long-term	1,858,300	1,951,280
Senior Notes
Long-Term Debt [Line Items]
Notes payable, gross	350,000	350,000
Unamortized deferred financing costs	(15,280)	(17,238)
Unamortized original issue discount	(5,672)	(6,282)
Net notes payable	329,048	326,480
Current portion of Notes Payable	0	0
Notes Payable - long-term	$ 329,048	$ 326,480

Notes Payable - Summary of Matu

Notes Payable - Summary of Maturity of the Notes Payable (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Debt Disclosure [Abstract]
2,018	$ 33,945
2,019	33,945
2,020	33,945
2,021	33,945
2,022	33,945
Thereafter	1,436,067
Total	$ 1,605,792

Notes Payable - Schedule of Int

Notes Payable - Schedule of Interest Rates and Interest Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Long-Term Debt [Line Items]
Interest rate—reference			8.50%
Non-refundable fee—unused facility	0.50%	0.50%	0.50%
Interest expense and service fees	$ 138,041	$ 140,470	$ 56,760
Loss on early extinguishment of debt	992	0	0
Financing costs expensed	5,487	0	0
Amortization of deferred financing fees	7,316	6,073	82
Amortization of original issuance discount	3,860	2,970	0
Amortization of net present value of deferred consideration	632	2,617	1,264
Other interest expense	814	758	722
Total interest expense	$ 157,142	$ 152,888	$ 58,828
Minimum
Long-Term Debt [Line Items]
Interest rate—LIBOR	5.14%	4.49%	5.00%
Interest rate—reference		6.75%
Maximum
Long-Term Debt [Line Items]
Interest rate—LIBOR	6.68%	7.75%	7.75%
Interest rate—reference		8.75%
Senior Notes
Long-Term Debt [Line Items]
Interest rate—Notes	10.875%	10.875%	0.00%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017vote$ / sharesshares	Dec. 31, 2016$ / sharesshares
Equity [Abstract]
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, par value (in usd per share) | $ / shares	$ 0.0001	$ 0.0001
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, par value (in usd per share) | $ / shares	$ 0.0001	$ 0.0001
Number of vote per share | vote	1

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	Aug. 22, 2017	Aug. 11, 2017	Feb. 09, 2016	Oct. 30, 2015	Apr. 30, 2017	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in usd per share)						$ 0.0001		$ 0.0001	$ 0.0001
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense						$ 37,100,000		$ 37,100,000
Weighted average period to be recognized								2 years 2 months 12 days
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense						$ 13,700,000		$ 13,700,000
Weighted average period to be recognized								2 years
Chief Financial Officer | Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)							223,214
Chief Executive Officer | 2015 Performance Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested period of award shares					2 years 4 months 21 days
Vested (in shares)								1,661,439
Canceled (in shares)								2,032,315
Chief Operating Officer | Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)							260,416
Chief Administrative Officer | Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)							148,810
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares issued (in shares)						38,000,000		38,000,000
Shares available for grant (in shares)						14,500,870		14,500,870
Aggregate intrinsic value, outstanding						$ 470,000		$ 470,000
2013 Stock Incentive Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)								160,428
Vested (in shares)								3,695,045
Canceled (in shares)								364,974
2013 Stock Incentive Plan | Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense								$ 1,200,000	$ 4,100,000
2013 Stock Incentive Plan | Chief Executive Officer | Performance-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense								$ 12,100,000
Granted (in shares)						307,812		461,958		3,693,754
Vested period of award shares								3 years
2017 CEO Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost		$ 10,375,000						$ 2,200,000
2017 CEO Award | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expected to vest outstanding percentage						33.30%		33.30%
2017 CEO Award | Chief Executive Officer | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	1,032,500
Vested period of award shares	3 years
Vested (in shares)	282,500
Number expected to vest (in shares)						750,000		750,000
2017 CEO Award | Chief Executive Officer | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	612,419
Vested period of award shares	3 years
2017 CEO Award | Chief Executive Officer | Tranche One | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number expected to vest (in shares)						250,000		250,000
2017 CEO Award | Chief Executive Officer | Tranche Two | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number expected to vest (in shares)						250,000,000		250,000,000
2017 CEO Award | Chief Executive Officer | Tranche Three | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number expected to vest (in shares)						250,000,000		250,000,000
Constant Contact 2011 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares issued (in shares)			10,000,000
Shares available for grant (in shares)						9,249,168		9,249,168
Aggregate intrinsic value, outstanding			$ 22,300,000			$ 635,000		$ 635,000
Business acquisition, estimated aggregate purchase price			$ 5,400,000
Constant Contact 2011 Stock Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, period increase (decrease) (in shares)			2,202,846
Granted (in shares)								1,324,328
Vested period of award shares								4 years
Vested (in shares)								659,019
Canceled (in shares)								597,823
Constant Contact 2011 Stock Plan | Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, period increase (decrease) (in shares)			2,143,987
Aggregate stock-based compensation expense								$ 16,900,000
Combined 2016 Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense								$ 1,200,000	700,000
Sales and marketing | Combined 2016 Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense									300,000
Engineering and development | Combined 2016 Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense									100,000
General and administrative | Combined 2016 Liability Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate stock-based compensation expense									$ 300,000
Constant Contact, Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in usd per share)			$ 0.01
Business acquisition, estimated aggregate purchase price			$ 1,100,000,000	$ 1,100,000,000
Minimum | 2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period								3 years
Minimum | 2013 Stock Incentive Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period								3 years
Maximum | 2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period								4 years
Maximum | 2013 Stock Incentive Plan | Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period								4 years

Stock-Based Compensation - Weig

Stock-Based Compensation - Weighted Average Assumptions (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	2.20%	1.50%	1.80%
Expected volatility	50.50%	53.10%	56.10%
Expected life (in years)	6 years 3 months	6 years 3 months	6 years 3 months
Expected dividend yield	0.00%	0.00%	0.00%
Constant Contact 2011 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.98%	1.27%
Expected volatility	49.60%	53.10%
Expected life (in years)	4 years 9 months	4 years 9 months
Expected dividend yield	0.00%	0.00%

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Options (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Feb. 09, 2016
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, stock options, outstanding (in shares)	9,607,431
Stock options, granted (in shares)	774,018
Exercise of stock options, (in shares)	(672)
Stock options, forfeited (in shares)	(1,064,535)
Stock options, canceled (in shares)	(741,092)
Ending balance, stock options, outstanding (in shares)	8,575,150
Weighted- Average Exercise Price
Beginning balance, weighted - average exercise price, outstanding (in usd per share)	$ 12.79
Weighted - average exercise price, granted (in usd per share)	7.84
Weighted - average exercise price, exercised (in usd per share)	8.05
Weighted - average exercise price, forfeited (in usd per share)	12.55
Weighted - average exercise price, canceled (in usd per share)	13.69
Ending balance, weighted - average exercise price, outstanding (in usd per share)	$ 12.30
Stock Option Activity, Additional Disclosures
Weighted - average remaining contractual term, outstanding	6 years 2 months 12 days
Aggregate intrinsic value, outstanding	$ 470
Stock options, exercisable at December 31, 2017 (in shares)	6,246,799
Weighted - average exercise price, exercisable at December 31, 2017 (in usd per share)	$ 12.80
Weighted - average remaining contractual term, exercisable at December 31, 2017	5 years 6 months
Aggregate intrinsic value, exercisable at December 31, 2017	$ 10
Stock options, expected to vest after December 31, 2017 (in shares)	2,328,351
Weighted - average exercise price, expected to vest after December 31, 2017 (in usd per share)	$ 10.96
Weighted - average remaining contractual term, expected to vest after December 31, 2017	8 years 1 month 6 days
Aggregate intrinsic value, expected to vest after December 31, 2017	$ 1
Stock options, exercisable as of December 31, 2017 and expected to vest thereafter (in shares)	8,575,150
Weighted - average exercise price, exercisable as of December 31, 2017 and expected to vest thereafter (in usd per share)	$ 12.30
Weighted - average remaining contractual term, exercisable as of December 31, 2017 and expected to vest thereafter	6 years 2 months 12 days
Aggregate intrinsic value, exercisable as of December 31, 2017 and expected to vest thereafter	$ 470
Estimated fair value of the Company's common stock	$ 8.40
Constant Contact 2011 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance, stock options, outstanding (in shares)	1,931,830
Stock options, granted (in shares)	14,724
Exercise of stock options, (in shares)	(355,557)
Stock options, forfeited (in shares)	(531,988)
Stock options, canceled (in shares)	(170,749)
Ending balance, stock options, outstanding (in shares)	888,260
Weighted- Average Exercise Price
Beginning balance, weighted - average exercise price, outstanding (in usd per share)	$ 8.73
Weighted - average exercise price, granted (in usd per share)	8.15
Weighted - average exercise price, exercised (in usd per share)	5.75
Weighted - average exercise price, forfeited (in usd per share)	10.04
Weighted - average exercise price, canceled (in usd per share)	10.62
Ending balance, weighted - average exercise price, outstanding (in usd per share)	$ 8.75
Stock Option Activity, Additional Disclosures
Weighted - average remaining contractual term, outstanding	4 years 3 months 18 days
Aggregate intrinsic value, outstanding	$ 635	$ 22,300
Stock options, exercisable at December 31, 2017 (in shares)	538,766
Weighted - average exercise price, exercisable at December 31, 2017 (in usd per share)	$ 8.40
Weighted - average remaining contractual term, exercisable at December 31, 2017	3 years 9 months 18 days
Aggregate intrinsic value, exercisable at December 31, 2017	$ 514
Stock options, expected to vest after December 31, 2017 (in shares)	349,494
Weighted - average exercise price, expected to vest after December 31, 2017 (in usd per share)	$ 9.29
Weighted - average remaining contractual term, expected to vest after December 31, 2017	5 years
Aggregate intrinsic value, expected to vest after December 31, 2017	$ 121
Stock options, exercisable as of December 31, 2017 and expected to vest thereafter (in shares)	888,260
Weighted - average exercise price, exercisable as of December 31, 2017 and expected to vest thereafter (in usd per share)	$ 8.75
Weighted - average remaining contractual term, exercisable as of December 31, 2017 and expected to vest thereafter	4 years 3 months
Aggregate intrinsic value, exercisable as of December 31, 2017 and expected to vest thereafter	$ 635
Estimated fair value of the Company's common stock	$ 8.40

Stock-Based Compensation - Su79

Stock-Based Compensation - Summary of Restricted Stock Awards and Restricted Stock Units (Detail)	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Restricted Stock Awards | Constant Contact 2011 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested, beginning balance (in shares) | shares	1,473,655
Granted (in shares) | shares	1,324,328
Vested (in shares) | shares	(659,019)
Canceled (in shares) | shares	(597,823)
Non-vested, ending balance (in shares) | shares	1,541,141
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share) | $ / shares	$ 9.25
Weighted average grant date fair value, granted (in usd per share) | $ / shares	7.99
Weighted average grant date fair value, vested and unissued (in usd per share) | $ / shares	7.56
Weighted average grant date fair value, canceled (in usd per share) | $ / shares	8.48
Weighted average grant date fair value, non-vested, ending balance (in usd per share) | $ / shares	$ 8.30
Restricted Stock Awards | 2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested, beginning balance (in shares) | shares	7,332,537
Granted (in shares) | shares	160,428
Vested (in shares) | shares	(3,695,045)
Canceled (in shares) | shares	(364,974)
Non-vested, ending balance (in shares) | shares	3,432,946
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share) | $ / shares	$ 13.21
Weighted average grant date fair value, granted (in usd per share) | $ / shares	8.15
Weighted average grant date fair value, vested and unissued (in usd per share) | $ / shares	12.56
Weighted average grant date fair value, canceled (in usd per share) | $ / shares	12.13
Weighted average grant date fair value, non-vested, ending balance (in usd per share) | $ / shares	$ 13.79
Restricted Stock Units | 2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested, beginning balance (in shares) | shares	100,369
Granted (in shares) | shares	4,115,549
Vested (in shares) | shares	(804,920)
Canceled (in shares) | shares	(406,861)
Non-vested, ending balance (in shares) | shares	3,004,137
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, non-vested, beginning balance (in usd per share) | $ / shares	$ 12
Weighted average grant date fair value, granted (in usd per share) | $ / shares	7.94
Weighted average grant date fair value, vested and unissued (in usd per share) | $ / shares	8.01
Weighted average grant date fair value, canceled (in usd per share) | $ / shares	7.89
Weighted average grant date fair value, non-vested, ending balance (in usd per share) | $ / shares	$ 7.93

Stock-Based Compensation - Su80

Stock-Based Compensation - Summary of Total Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	$ 60,001	$ 58,267	$ 29,925
Cost of revenue
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	6,135	5,855	1,975
Sales and marketing
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	8,658	8,702	3,285
Engineering and development
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	6,090	5,989	1,988
General and administrative
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock-based compensation expense	$ 39,118	$ 37,721	$ 22,677

Accumulated Other Comprehensi81

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 124,383	$ 179,674
Other comprehensive income (loss)	3,125	(1,948)
Ending balance	83,005	124,383
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,395)	(1,798)
Other comprehensive income (loss)	3,091	(597)
Ending balance	696	(2,395)
Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,271)	80
Other comprehensive income (loss)	34	(1,351)
Ending balance	(1,237)	(1,271)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,666)	(1,718)
Ending balance	$ (541)	$ (3,666)

Redeemable Non-Controlling In82

Redeemable Non-Controlling Interest - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 07, 2017	Aug. 14, 2016	Jul. 13, 2016	May 16, 2016	Jan. 06, 2016	Jul. 31, 2016	Jan. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jul. 13, 2017	Jul. 01, 2017	Jul. 14, 2016	Jul. 12, 2016	Aug. 31, 2014
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest, change in redemption value												$ 14,200
Excess accretion of non-controlling interest								$ 7,247	$ 6,769	$ 0
Resume Labs Limited
Redeemable Noncontrolling Interest [Line Items]
Cost of acquisition							$ 1,500
Pseudio Limited
Redeemable Noncontrolling Interest [Line Items]
Cost of acquisition							$ 1,500
Ownership percentage											100.00%
WZ (UK) Ltd.
Redeemable Noncontrolling Interest [Line Items]
Ownership interest			86.40%	77.50%	57.50%								86.40%	76.40%	49.00%
Cost of acquisition					$ 2,100
Redeemable noncontrolling interest, equity, fair value					10,800
Exercised call option					30,000
Accretion period		24 months
Percentage of additional stake acquired			76.40%	20.00%									10.00%
Business acquisition, estimated aggregate purchase price	$ 25,000		$ 18,000	$ 15,400	$ 22,200	$ 25,000

Redeemable Non-Controlling In83

Redeemable Non-Controlling Interest - Schedule of Changes in Non-Controlling Interest (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Redeemable noncontrolling interest
Beginning balance, redeemable noncontrolling interest	$ 17,753
Accretion in excess of fair value	7,247
Payment of redeemable non-controlling interest	(25,000)
Ending balance, redeemable noncontrolling interest	$ 0

Income Taxes - Components of In

Income Taxes - Components of Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States	$ (117,715)	$ (137,197)	$ 1,258
Foreign	540	(52,593)	(1,046)
Total income (loss) before income taxes	$ (117,175)	$ (189,790)	$ 212

Income Taxes - Components of 85

Income Taxes - Components of Income Taxes Benefit and Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
U.S. federal	$ 319	$ 328	$ 1,827
State	2,610	744	696
Foreign	2,597	2,312	1,699
Total current provision	5,526	3,384	4,222
Deferred:
U.S. federal	(36,854)	(44,447)	(1,103)
State	(3,243)	(6,225)	1,952
Foreign	9,377	(10,037)	(818)
Change in valuation allowance	7,913	(52,533)	7,089
Total deferred provision	(22,807)	(113,242)	7,120
Total expense (benefit)	$ (17,281)	$ (109,858)	$ 11,342

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Statutory Federal Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Benefit [Line Items]
U.S. federal taxes at statutory rate	35.00%	35.00%	34.00%
State income taxes, net of federal benefit	0.60%	0.90%	685.00%
Nondeductible stock-based compensation	(7.90%)	(1.50%)	827.30%
Nondeductible litigation expenses	(7.90%)	0.00%	0.00%
Nondeductible transaction costs	0.00%	(2.90%)	856.50%
Nontaxable gain on redemption of equity interest	0.00%	0.00%	(674.90%)
Credits	1.10%	3.70%	(0.00%)
Foreign rate differential	1.20%	(4.60%)	299.70%
Rate change	7.50%	0.40%	216.50%
Prior year true-up stock-based compensation—U.S.	0.00%	0.00%	(132.80%)
Other	(5.20%)	(0.50%)	(217.50%)
Total	14.90%	57.20%	5349.40%
Foreign Tax Authority
Income Tax Benefit [Line Items]
Other foreign permanent differences	(2.90%)	(0.40%)	187.80%
Change in valuation allowance	9.50%	(4.10%)	(130.80%)
Domestic Tax Authority
Income Tax Benefit [Line Items]
Change in valuation allowance	(16.10%)	31.20%	3398.60%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Mar. 11, 2015	Nov. 20, 2014	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 09, 2016
Operating Loss Carryforwards [Line Items]
Deferred tax expense (benefit)				$ 22,807	$ 113,242	$ (7,120)
Unrecognized tax positions			$ 0	1,100	0
Unrecognized tax benefits penalties and interest expense				0	0	0
Valuation allowance, deferred tax asset, increase (decrease)			10,000		(70,600)	7,100
Tax expense				(17,281)	(109,858)	11,342
Federal and state deferred tax expense (benefit)				(21,800)	(111,200)	800
Tax cuts and jobs act of 2017, change in tax rate, deferred tax asset, provisional income tax expense (benefit)				16,900
Tax credits				2,200
Deferred foreign income tax expense (benefit)				1,000
Accounting treatment for goodwill			2,000		2,000	800
Federal and state current income taxes				1,800	1,100	2,500
Foreign current tax				2,597	2,312	$ 1,699
Loss carry-forwards available to future foreign taxable income				26,700
Credit carryforward			$ 28,271	27,337	$ 28,271
Net operating loss carry-forwards annual limitations				$ 77,100
Common stock, shares issued (in shares)			134,793,857	140,190,695	134,793,857
Undistributed earnings				$ 24,800
Cumulatively profitable foreign jurisdiction				$ 24,800
Follow-On Public Offering
Operating Loss Carryforwards [Line Items]
Common stock, shares issued (in shares)		13,000,000
Number of shares sold by the selling stockholders (in shares)	12,000,000
Common stock, (in USD per share)	$ 19
Over-Allotment Option
Operating Loss Carryforwards [Line Items]
Number of shares sold by the selling stockholders (in shares)	1,800,000	1,950,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Change in valuation allowance				(9.50%)	4.10%	130.80%
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Change in valuation allowance				16.10%	(31.20%)	(3398.60%)
Valuation allowance, deferred tax asset, increase (decrease)				$ 37,900
Federal NOL carry-forward				157,600
Deferred tax assets, capital loss carryforwards				3,400
Credit carryforward				17,600
Federal And State
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)					$ 10,000
Increase (Decrease) in Deferred Income Taxes					40,600
Tax credits				1,200
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Federal NOL carry-forward				128,600
Deferred tax assets, capital loss carryforwards				1,400
Credit carryforward				12,300
CHINA
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)				200
Loss carry-forwards available to future foreign taxable income				700
NETHERLANDS
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)				3,400
Loss carry-forwards available to future foreign taxable income				12,600
United Kingdom
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)				2,400
Loss carry-forwards available to future foreign taxable income				13,200
ISRAEL
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)				200
SINGAPORE
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)				0
Loss carry-forwards available to future foreign taxable income				200
Constant Contact, Inc.
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)					70,600
Constant Contact, Inc. | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Federal NOL carry-forward							$ 60,200
Credit carryforward							10,900
Constant Contact, Inc. | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Federal NOL carry-forward							32,400
Credit carryforward							$ 9,200
ASU 2016-09 | Accounting Standards Update 2016-09, Excess Tax Benefit Component [Member]
Operating Loss Carryforwards [Line Items]
Tax adjustments				900	900
Forfeitures				900	900
Amount of net operating loss carry-forwards available to offset future U.S. federal taxable income			$ 1,500		1,500	$ 1,500
Amount of net operating loss carry-forwards available to offset future state taxable income			$ 700		700	$ 700
Research Tax Credit Carryforward | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)					7,800
Capital Loss Carryforward | Federal And State
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)					1,200
Valuation Allowance, Operating Loss Carryforwards | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease)					$ 1,000
Subsidiaries | Non-US
Operating Loss Carryforwards [Line Items]
Cash				$ 11,300

Income Taxes - Components of th

Income Taxes - Components of the Company's Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Net operating loss carry forward	$ 47,098	$ 76,060
Credit carryforward	27,337	28,271
Other		5,414
Other	(327)
Deferred compensation	215	364
Deferred revenue	19,729	26,291
Other reserves		3,545
Other reserves	(72)
Stock-based compensation	14,887	25,424
Total deferred income tax assets	108,867	165,369
Purchased intangible assets	(47,580)	(119,719)
Goodwill	(27,922)	(37,099)
Property and equipment	(9,024)	(12,403)
Total deferred income tax liabilities	(84,526)	(169,221)
Valuation allowance	(44,068)	(36,091)
Net deferred income tax liabilities	$ (19,727)	$ (39,943)

Income Taxes Unrecognized Tax B

Income Taxes Unrecognized Tax Benefits Rollforward (Details)	12 Months Ended
	Dec. 31, 2017USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at December 31, 2016	$ 0
Addition for tax positions of prior years	734,000
Addition for tax positions of current year	395,000
Unrecognized tax benefits at December 31, 2017	$ 1,129,000

Severance and Other Exit Cost90

Severance and Other Exit Costs - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Jan. 31, 2017position	Dec. 31, 2017USD ($)position	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Restructuring Cost and Reserve [Line Items]
Severance costs incurred		$ 15,810,000	$ 24,224,000	$ 1,489,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs incurred		13,110,000
Severance costs paid		(11,001,000)
Restructuring reserve		3,668,000	1,559,000
Facility closing
Restructuring Cost and Reserve [Line Items]
Severance costs paid		(6,413,000)
Restructuring reserve		6,005,000	$ 9,020,000
Facilities charge		2,700,000
Sublease income		698,000
2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	660
Severance costs incurred		13,100,000
2017 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs paid		(9,400,000)
Restructuring reserve		3,700,000
2017 Restructuring Plan | Facility closing
Restructuring Cost and Reserve [Line Items]
Severance costs paid		(1,000,000)
Restructuring reserve		300,000
Facilities charge		$ 1,300,000
2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position		265
2016 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance costs paid		$ (1,600,000)
Restructuring and related cost, expected cost remaining		0
2016 Restructuring Plan | Facility closing
Restructuring Cost and Reserve [Line Items]
Severance costs paid		(4,600,000)
Facilities charge		1,400,000
Restructuring and related cost, expected cost remaining		5,600,000
2014 Restructuring Plan | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost remaining		0
2014 Restructuring Plan | Facility closing
Restructuring Cost and Reserve [Line Items]
Severance costs paid		(800,000)
Restructuring and related cost, expected cost remaining		100,000			$ 3,000,000
Sublease income		$ 700,000
Constant Contact, Inc. | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | position	50

Severance and Other Exit Cost91

Severance and Other Exit Costs - Summary of Activity Related to Company's Exit Costs Accrual (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Severance charges	$ 15,810	$ 24,224	$ 1,489
Facility closing
Restructuring Reserve [Roll Forward]
Beginning Balance	9,020
Facilities charge	2,700
Sublease income	698
Cash paid	(6,413)
Ending Balance	6,005	9,020
Employee Severance
Restructuring Reserve [Roll Forward]
Beginning Balance	1,559
Severance charges	13,110
Cash paid	(11,001)
Ending Balance	$ 3,668	$ 1,559

Severance and Other Exit Cost92

Severance and Other Exit Costs - Summary of Severance Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Total severance charges	$ (15,810)	$ (24,224)	$ (1,489)
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Total severance charges	(4,100)	8,986	45
Sales and marketing
Restructuring Cost and Reserve [Line Items]
Total severance charges	(3,586)	(6,550)	(555)
Engineering and development
Restructuring Cost and Reserve [Line Items]
Total severance charges	(1,469)	(4,288)	(636)
General and administrative
Restructuring Cost and Reserve [Line Items]
Total severance charges	$ (6,655)	$ (4,400)	$ (343)

Commitments and Contingencies -

Commitments and Contingencies - Summary of Future Minimum Annual Rental Payments Under these Leases (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 21,526
2,019	20,212
2,020	19,633
2,021	16,205
2,022	13,772
Thereafter	36,612
Total minimum lease payments	$ 127,960

Commitments and Contingencies94

Commitments and Contingencies - Additional Information (Detail)	Oct. 16, 2017	Aug. 07, 2015defendant	May 04, 2015USD ($)	Aug. 31, 2012defendantpatent	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Loss Contingencies [Line Items]
Total net rent expense					$ 22,100,000	$ 20,000,000	$ 8,200,000
Total sublease income					500,000	$ 400,000	$ 200,000
SEC investigations reserve					8,000,000
Machado | Minimum
Loss Contingencies [Line Items]
Disclosure of customer payment threshold			$ 500
Boston Regional SEC Office
Loss Contingencies [Line Items]
SEC investigations reserve					$ 8,000,000
RPost Holdings
Loss Contingencies [Line Items]
Number of defendants | defendant				5
Number of patents allegedly infringed | patent				5
Myers vs Constant Contact
Loss Contingencies [Line Items]
Period to consider withdrawing lawsuit	30 days
Constant Contact, Inc. | McGee vs Constant Contact
Loss Contingencies [Line Items]
Number of defendants | defendant		2

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contributions per employee (in usd)	$ 18,000
Employers matching contribution, annual vesting percentage	100.00%
Cost recognized	$ 6,300,000	$ 5,700,000	$ 2,500,000
Defined Contribution Plan, Tranche One
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of match	100.00%
Employer matching contribution, percent of employees' gross pay	3.00%
Defined Contribution Plan, Tranche Two
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of match	50.00%
Employer matching contribution, percent of employees' gross pay	2.00%

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	Dec. 09, 2015	Feb. 29, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 09, 2016	Nov. 30, 2013
Related Party Transaction [Line Items]
Prepaid expenses and other current assets			$ 29,327,000	$ 28,678,000
Amount included in accounts receivable			15,945,000	13,088,000
Notes payable, gross			$ 1,605,792,000
Former Chief Executive Officer
Related Party Transaction [Line Items]
Common stock outstanding ownership percentage			5.00%
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense			$ 1,500,000	1,300,000
Related party transaction expense			14,800,000	14,300,000	$ 12,300,000
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Amount included in accounts payable and accrued expense			1,300,000	1,100,000
Prepaid expenses and other current assets			200,000	200,000
Amount included in accounts receivable			600,000	700,000
Related party transaction expense			4,275,000	5,100,000	$ 6,300,000
Goldman Sachs & Co.
Related Party Transaction [Line Items]
Payments of debt issuance costs				800,000
Incremental First Lien Term Loan
Related Party Transaction [Line Items]
Aggregate principal amount not to exceed		$ 735,000,000
Revolving Credit Facility
Related Party Transaction [Line Items]
Aggregate principal amount not to exceed		165,000,000	165,000,000			$ 165,000,000	$ 125,000,000
Revolving Credit Facility | Goldman Sachs & Co.
Related Party Transaction [Line Items]
Loan commitment			57,600,000
Senior Notes
Related Party Transaction [Line Items]
Senior notes		350,000,000
Notes payable, gross			350,000,000	350,000,000
Related Party Transaction, Long-term Debt Sold | Senior Notes | Goldman Sachs & Co.
Related Party Transaction [Line Items]
Related party transaction amount		148,800,000
Loan Lending Commitment Arrangement Fees | Goldman Sachs Lending Partners LLC
Related Party Transaction [Line Items]
Related party transaction amount			500,000
Interest Rate Cap Premium | Goldman Sachs & Co.
Related Party Transaction [Line Items]
Interest rate cap agreement period	3 years
Related party transaction amount				3,000,000
Expense Reimbursement | Goldman Sachs Lending Partners LLC
Related Party Transaction [Line Items]
Related party transaction amount			$ 0
Constant Contact, Inc. | Goldman Sachs & Co.
Related Party Transaction [Line Items]
Related party transaction expense				$ 8,600,000
Constant Contact, Inc. | Incremental First Lien Term Loan | Goldman Sachs & Co.
Related Party Transaction [Line Items]
Notes payable, gross		$ 312,400,000

Related Party Transactions - Su

Related Party Transactions - Summary of Related Party Transactions (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Revenue	$ (294,250)	$ (295,222)	$ (292,258)	$ (295,137)	$ (292,123)	$ (291,193)	$ (290,713)	$ (237,113)	$ (1,176,867)	$ (1,111,142)	$ (741,315)
Sales and marketing									277,460	303,511	145,419
Engineering and development									78,772	87,601	26,707
General and administrative									163,972	143,095	81,386
Immediate Family Member of Management or Principal Owner
Related Party Transaction [Line Items]
Cost of revenue									12,100	12,200	10,200
Sales and marketing									1,200	500	700
Engineering and development									1,300	1,300	1,100
General and administrative									200	300	300
Total related party transaction expense, net									14,800	14,300	12,300
Chief Executive Officer and a Director
Related Party Transaction [Line Items]
Revenue									(4,250)	(3,100)	(1,300)
Revenue (contra)									7,850	7,500	7,000
Total related party transaction impact to revenue									3,600	4,400	5,700
Cost of revenue									675	700	600
Total related party transaction expense, net									$ 4,275	$ 5,100	$ 6,300

Segment Information (Details)

Segment Information (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2017USD ($)Segment	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017Segment	Dec. 31, 2016USD ($)Segment	Dec. 31, 2015USD ($)	Jul. 27, 2016	Apr. 08, 2016	Jan. 06, 2016	Dec. 31, 2014	Aug. 31, 2014
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	3									2	2
Revenue	$ 294,250,000	$ 295,222,000	$ 292,258,000	$ 295,137,000	$ 292,123,000	$ 291,193,000	$ 290,713,000	$ 237,113,000	$ 1,176,867,000		$ 1,111,142,000	$ 741,315,000
Gross profit	144,517,000	$ 136,357,000	$ 145,675,000	$ 146,388,000	147,112,000	$ 141,766,000	$ 137,636,000	100,637,000	572,937,000		527,151,000	316,280,000
Net loss									(99,784,000)		(81,229,000)	(25,770,000)
Interest expense, net									(156,406,000)		(152,312,000)	(58,414,000)
Income tax expense (benefit)									(17,281,000)		(109,858,000)	11,342,000
Depreciation									55,185,000		60,360,000	34,010,000
Amortization of other intangible assets									140,354,000		143,562,000	91,057,000
Stock-based compensation									60,001,000		58,267,000	29,925,000
Restructuring expenses									15,810,000		24,224,000	1,489,000
Transaction costs									773,000		32,284,000	9,582,000
Gain of unconsolidated entities									110,000		565,000	(9,200,000)
Goodwill and Intangible Asset Impairment									31,460,000
Impairment of other long-lived assets(4)									18,731,000		9,039,000	0
SEC investigations reserve									8,000,000
Adjusted EBITDA									350,814,000		288,396,000	219,249,000
Total assets	2,601,086,000				$ 2,756,274,000				2,601,086,000		2,756,274,000
Intercompany revenue									9,900,000		7,600,000	4,900,000
Loss on extinguishment of debt, before write off of debt issuance cost									6,500,000
Loss of unconsolidated entities									(110,000)		1,297,000	14,640,000
Impairment of goodwill	$ 12,100,000								12,129,000		0	0
Web presence
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2
Revenue									641,993,000		648,732,000	596,687,000
Gross profit									298,687,000		309,116,000	267,946,000
Net loss									(70,375,000)		(24,382,000)	(34,049,000)
Interest expense, net									(67,491,000)		(68,617,000)	(56,663,000)
Income tax expense (benefit)									2,575,000		(79,632,000)	12,756,000
Depreciation									37,634,000		33,590,000	31,947,000
Amortization of other intangible assets									60,277,000		72,733,000	83,106,000
Stock-based compensation									46,641,000		41,481,000	25,513,000
Restructuring expenses									9,131,000		1,625,000	1,210,000
Transaction costs									0		31,260,000	8,265,000
Gain of unconsolidated entities									110,000		565,000	(9,200,000)
Goodwill and Intangible Asset Impairment									600,000
Impairment of other long-lived assets(4)											9,039,000	0
SEC investigations reserve									4,323,000
Adjusted EBITDA									158,187,000		153,766,000	194,611,000
Total assets	$ 1,534,225,000								1,534,225,000
Impairment of goodwill									0
Email marketing
Segment Reporting Information [Line Items]
Revenue									401,250,000		326,808,000	0
Gross profit									254,941,000		173,163,000	0
Net loss									(10,615,000)		(55,857,000)	0
Interest expense, net									(86,914,000)		(81,469,000)	0
Income tax expense (benefit)									5,152,000		(33,543,000)	0
Depreciation									13,912,000		23,747,000	0
Amortization of other intangible assets									74,467,000		64,679,000	0
Stock-based compensation									6,934,000		12,403,000	0
Restructuring expenses									5,581,000		22,379,000	0
Transaction costs									773,000		984,000	0
Gain of unconsolidated entities									0		0	0
Goodwill and Intangible Asset Impairment									0
Impairment of other long-lived assets(4)											0	0
SEC investigations reserve									2,751,000
Adjusted EBITDA									185,869,000		116,261,000	0
Total assets	903,869,000								903,869,000
Impairment of goodwill									0
Domain
Segment Reporting Information [Line Items]
Revenue									133,624,000		135,602,000	144,628,000
Gross profit									19,309,000		44,872,000	48,334,000
Net loss									(18,794,000)		(990,000)	8,279,000
Interest expense, net									(2,001,000)		(2,226,000)	(1,751,000)
Income tax expense (benefit)									(25,008,000)		3,317,000	(1,414,000)
Depreciation									3,639,000		3,023,000	2,063,000
Amortization of other intangible assets									5,610,000		6,150,000	7,951,000
Stock-based compensation									6,426,000		4,383,000	4,412,000
Restructuring expenses									1,098,000		220,000	279,000
Transaction costs									0		40,000	1,317,000
Gain of unconsolidated entities									0		0	0
Goodwill and Intangible Asset Impairment									30,860,000
Impairment of other long-lived assets(4)											0	0
SEC investigations reserve									926,000
Adjusted EBITDA									6,758,000		18,369,000	24,638,000
Total assets	$ 144,615,000								144,615,000
Impairment of goodwill									12,129,000
WZ UK Ltd.
Segment Reporting Information [Line Items]
Remeasurement gain (loss)											11,400,000
Ownership interest															57.50%		49.00%
Loss of unconsolidated entities												$ 13,900,000
AppMachine
Segment Reporting Information [Line Items]
Remeasurement gain (loss)											$ 4,800,000
Ownership interest													100.00%			40.00%
Fortifico Limited
Segment Reporting Information [Line Items]
Ownership interest					33.00%						33.00%			33.00%
Impairment on the remaining investment											$ 4,700,000
Webzai Ltd
Segment Reporting Information [Line Items]
Impairment of other long-lived assets(4)											4,900,000
Constant Contact, Inc.
Segment Reporting Information [Line Items]
Restructuring expenses								$ 11,600,000			22,400,000
Impairment of other long-lived assets(4)											2,000,000
Developed And In Process Technology | Webzai Ltd
Segment Reporting Information [Line Items]
Impairment of Intangible Assets, Finite-lived											7,000,000
Developed And In Process Technology | Constant Contact, Inc.
Segment Reporting Information [Line Items]
Impairment of Intangible Assets, Finite-lived											$ 2,000,000
Domain Name Intangible Assets
Segment Reporting Information [Line Items]
Impairment of other long-lived assets(4)									13,800,000
Impairment of Intangible Assets, Finite-lived									13,800,000
Developed technology and customer relationships
Segment Reporting Information [Line Items]
Impairment of other long-lived assets(4)									4,900,000
Developed technology and customer relationships | Directi And Buy Domains
Segment Reporting Information [Line Items]
Impairment of Intangible Assets, Finite-lived									4,900,000
Debt investment
Segment Reporting Information [Line Items]
Impairment losses on investments									$ 600,000

Geographic and Other Informat99

Geographic and Other Information - Revenues Classified by Major Geographical Areas (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 294,250	$ 295,222	$ 292,258	$ 295,137	$ 292,123	$ 291,193	$ 290,713	$ 237,113	$ 1,176,867	$ 1,111,142	$ 741,315
United States
Segment Reporting Information [Line Items]
Revenue									845,305	787,915	465,446
International
Segment Reporting Information [Line Items]
Revenue									$ 331,562	$ 323,227	$ 275,869

Geographic and Other Informa100

Geographic and Other Information - Schedule of Tangible Long-Lived Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Geographic Information [Line Items]
Long lived assets	$ 95,452	$ 95,272
United States
Geographic Information [Line Items]
Long lived assets	89,325	89,147
International
Geographic Information [Line Items]
Long lived assets	$ 6,127	$ 6,125

Geographic and Other Informa101

Geographic and Other Information - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disaggregation of Revenue [Line Items]
Revenue	$ 294,250	$ 295,222	$ 292,258	$ 295,137	$ 292,123	$ 291,193	$ 290,713	$ 237,113	$ 1,176,867	$ 1,111,142	$ 741,315
Non-subscription Revenue
Disaggregation of Revenue [Line Items]
Revenue									$ 39,400	$ 39,400	$ 52,500
Percentage of revenue									3.00%	4.00%	7.00%

Quarterly Financial Data - Sche

Quarterly Financial Data - Schedule of Condensed Income Statement (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 294,250	$ 295,222	$ 292,258	$ 295,137	$ 292,123	$ 291,193	$ 290,713	$ 237,113	$ 1,176,867	$ 1,111,142	$ 741,315
Gross profit	144,517	136,357	145,675	146,388	147,112	141,766	137,636	100,637	572,937	527,151	316,280
Income (loss) from operations	14,660	(1,070)	12,647	13,594	24,260	8,879	(6,168)	(66,311)	39,831	(39,340)	53,186
Net loss attributable to Endurance International Group Holdings, Inc.	$ 7,473	$ (40,264)	$ (39,129)	$ (35,388)	$ (34,865)	$ (31,737)	$ (28,040)	$ 21,811	$ (107,308)	$ (72,831)	$ (25,770)
Basic net income (loss) per share attributable to Endurance International Group Holdings, Inc. (in usd per share)	$ 0.05	$ (0.29)	$ (0.29)	$ (0.26)	$ (0.26)	$ (0.24)	$ (0.21)	$ 0.17
Diluted net income (loss) per share attributable to Endurance International Group Holdings, Inc. (in usd per share)	$ 0.05	$ (0.29)	$ (0.29)	$ (0.26)	$ (0.26)	$ (0.24)	$ (0.21)	$ 0.16

Quarterly Financial Data - Narr

Quarterly Financial Data - Narrative (Details) - USD ($)	Feb. 09, 2016	Oct. 30, 2015	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Line Items]
Restructuring expenses					$ 15,810,000	$ 24,224,000	$ 1,489,000
Increase in interest expense						94,100,000
Income tax expense (benefit)					17,281,000	109,858,000	(11,342,000)
Valuation allowance, deferred tax asset, increase (decrease)			$ 10,000,000			(70,600,000)	7,100,000
Federal and state deferred tax expense (benefit)					21,800,000	111,200,000	(800,000)
Tax cuts and jobs act of 2017, change in tax rate, deferred tax asset, provisional income tax expense (benefit)					16,900,000
Tax credits					2,200,000
Deferred foreign income tax expense (benefit)					1,000,000
Current federal tax expense (benefit)					319,000	328,000	1,827,000
Unrecognized tax benefits			$ 0		1,129,000	0	0
Foreign current tax					$ 2,597,000	2,312,000	$ 1,699,000
Constant Contact, Inc.
Accounting Policies [Line Items]
Business acquisition, estimated aggregate purchase price	$ 1,100,000,000	$ 1,100,000,000
Transaction costs				$ 31,100,000
Restructuring expenses				$ 11,600,000		22,400,000
Valuation allowance, deferred tax asset, increase (decrease)						$ 70,600,000

Supplemental Guarantor Finan104

Supplemental Guarantor Financial Information (Details)	3 Months Ended
	Dec. 31, 2016USD ($)guarantor	Jan. 30, 2017USD ($)	Feb. 29, 2016USD ($)	Feb. 09, 2016USD ($)
Guarantor Obligations [Line Items]
Number of guarantors sold | guarantor	2
Senior Notes
Guarantor Obligations [Line Items]
Senior notes		$ 350,000,000	$ 350,000,000	$ 350,000,000
Interest rate			10.875%
CardStar | Guarantor Subsidiaries
Guarantor Obligations [Line Items]
Proceeds from sale of assets	$ 100,000

Supplemental Guarantor Finan105

Supplemental Guarantor Financial Information - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 66,493	$ 53,596	$ 33,030	$ 32,379
Restricted cash	2,625	3,302
Accounts receivable	15,945	13,088
Prepaid domain name registry fees	53,805	55,444
Prepaid expenses and other current assets	29,327	28,678
Total current assets	168,195	154,108
Intercompany receivables, net	0	0
Property and equipment—net	95,452	95,272
Goodwill	1,850,582	1,859,909	1,207,255
Other intangible assets—net	455,440	612,057
Investment in subsidiaries	0	0
Other assets	31,417	34,928
Total assets	2,601,086	2,756,274
Current liabilities:
Accounts payable	11,058	16,074
Accrued expenses and other current liabilities	108,479	97,858
Deferred revenue	361,940	355,190
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	7,630	6,690
Deferred consideration, short-term	4,365	5,273
Total current liabilities	527,417	516,785
Long-term deferred revenue	90,972	89,200
Notes payable	1,858,300	1,951,280
Capital lease obligations—long term	7,719	512
Deferred consideration	3,551	7,444
Other long-term liabilities	30,122	48,917
Total liabilities	2,518,081	2,614,138
Redeemable non-controlling interest	0	17,753
Equity	83,005	124,383
Total liabilities, redeemable non-controlling interest and stockholders’ equity	2,601,086	2,756,274
Eliminations
Current assets:
Cash and cash equivalents	0	0	0	0
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	(297)
Prepaid expenses and other current assets	0	0
Total current assets	0	(297)
Intercompany receivables, net	0	0
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	(1,441,501)	(1,432,281)
Other assets	0	0
Total assets	(1,441,501)	(1,432,578)
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	0	0
Deferred revenue	0	(943)
Current portion of notes payable	0	0
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	0
Total current liabilities	0	(943)
Long-term deferred revenue	0	0
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration	0	0
Other long-term liabilities	0	0
Total liabilities	0	(943)
Redeemable non-controlling interest		0
Equity	(1,441,501)	(1,431,635)
Total liabilities, redeemable non-controlling interest and stockholders’ equity	(1,441,501)	(1,432,578)
Parent | Reportable Legal Entities
Current assets:
Cash and cash equivalents	92	3	12	1
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	0
Prepaid expenses and other current assets	(12)	0
Total current assets	80	3
Intercompany receivables, net	33,637	31,665
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	49,288	92,068
Other assets	0	0
Total assets	83,005	123,736
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	0	0
Deferred revenue	0	0
Current portion of notes payable	0	0
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	0
Total current liabilities	0	0
Long-term deferred revenue	0	0
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Redeemable non-controlling interest		0
Equity	83,005	123,736
Total liabilities, redeemable non-controlling interest and stockholders’ equity	83,005	123,736
Issuer | Reportable Legal Entities
Current assets:
Cash and cash equivalents	2	4	67	4,347
Restricted cash	0	0
Accounts receivable	0	0
Prepaid domain name registry fees	0	0
Prepaid expenses and other current assets	86	81
Total current assets	88	85
Intercompany receivables, net	606,834	799,953
Property and equipment—net	0	0
Goodwill	0	0
Other intangible assets—net	0	0
Investment in subsidiaries	1,355,013	1,299,562
Other assets	3,639	5,911
Total assets	1,965,574	2,105,511
Current liabilities:
Accounts payable	0	0
Accrued expenses and other current liabilities	24,509	27,208
Deferred revenue	0	0
Current portion of notes payable	33,945	35,700
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	0
Total current liabilities	58,454	62,908
Long-term deferred revenue	0	0
Notes payable	1,858,300	1,951,280
Capital lease obligations—long term	0	0
Deferred consideration	0	0
Other long-term liabilities	(468)	(745)
Total liabilities	1,916,286	2,013,443
Redeemable non-controlling interest		0
Equity	49,288	92,068
Total liabilities, redeemable non-controlling interest and stockholders’ equity	1,965,574	2,105,511
Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	54,473	39,034	21,286	18,702
Restricted cash	2,472	2,620
Accounts receivable	12,386	10,148
Prepaid domain name registry fees	28,291	31,044
Prepaid expenses and other current assets	20,062	17,996
Total current assets	117,684	100,842
Intercompany receivables, net	(498,213)	(690,761)
Property and equipment—net	81,693	82,901
Goodwill	1,673,851	1,683,121
Other intangible assets—net	450,778	592,095
Investment in subsidiaries	37,200	40,651
Other assets	21,373	23,153
Total assets	1,884,366	1,832,002
Current liabilities:
Accounts payable	9,532	13,801
Accrued expenses and other current liabilities	75,819	60,760
Deferred revenue	309,395	295,208
Current portion of notes payable	0	0
Current portion of capital lease obligations	7,630	6,690
Deferred consideration, short-term	4,365	4,415
Total current liabilities	406,741	380,874
Long-term deferred revenue	81,199	77,649
Notes payable	0	0
Capital lease obligations—long term	7,719	512
Deferred consideration	3,551	7,419
Other long-term liabilities	30,143	48,233
Total liabilities	529,353	514,687
Redeemable non-controlling interest		17,753
Equity	1,355,013	1,299,562
Total liabilities, redeemable non-controlling interest and stockholders’ equity	1,884,366	1,832,002
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets:
Cash and cash equivalents	11,926	14,555	$ 11,665	$ 9,329
Restricted cash	153	682
Accounts receivable	3,559	2,940
Prepaid domain name registry fees	25,514	24,697
Prepaid expenses and other current assets	9,191	10,601
Total current assets	50,343	53,475
Intercompany receivables, net	(142,258)	(140,857)
Property and equipment—net	13,759	12,371
Goodwill	176,731	176,788
Other intangible assets—net	4,662	19,962
Investment in subsidiaries	0	0
Other assets	6,405	5,864
Total assets	109,642	127,603
Current liabilities:
Accounts payable	1,526	2,273
Accrued expenses and other current liabilities	8,151	9,890
Deferred revenue	52,545	60,925
Current portion of notes payable	0	0
Current portion of capital lease obligations	0	0
Deferred consideration, short-term	0	858
Total current liabilities	62,222	73,946
Long-term deferred revenue	9,773	11,551
Notes payable	0	0
Capital lease obligations—long term	0	0
Deferred consideration	0	25
Other long-term liabilities	447	1,429
Total liabilities	72,442	86,951
Redeemable non-controlling interest		0
Equity	37,200	40,652
Total liabilities, redeemable non-controlling interest and stockholders’ equity	$ 109,642	$ 127,603

Supplemental Guarantor Finan106

Supplemental Guarantor Financial Information Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenue	$ 294,250,000	$ 295,222,000	$ 292,258,000	$ 295,137,000	$ 292,123,000	$ 291,193,000	$ 290,713,000	$ 237,113,000	$ 1,176,867,000	$ 1,111,142,000	$ 741,315,000
Cost of revenue									603,930,000	583,991,000	425,035,000
Gross profit	144,517,000	136,357,000	145,675,000	146,388,000	147,112,000	141,766,000	137,636,000	100,637,000	572,937,000	527,151,000	316,280,000
Operating expense:
Sales and marketing									277,460,000	303,511,000	145,419,000
Engineering and development									78,772,000	87,601,000	26,707,000
General and administrative									163,972,000	143,095,000	81,386,000
General and administrative											90,968,000
Transaction expenses									773,000	32,284,000	9,582,000
Impairment of goodwill	12,100,000								12,129,000	0	0
Total operating expense									533,106,000	566,491,000	263,094,000
Income (loss) from operations	14,660,000	(1,070,000)	12,647,000	13,594,000	24,260,000	8,879,000	(6,168,000)	(66,311,000)	39,831,000	(39,340,000)	53,186,000
Interest expense and other income, net									157,006,000	150,450,000	52,974,000
Income (loss) before income taxes and equity earnings of unconsolidated entities									(117,175,000)	(189,790,000)	212,000
Income tax expense (benefit)									(17,281,000)	(109,858,000)	11,342,000
Loss before equity earnings of unconsolidated entities									(99,894,000)	(79,932,000)	(11,130,000)
Equity income (loss) of unconsolidated entities, net of tax									(110,000)	1,297,000	14,640,000
Net loss									(99,784,000)	(81,229,000)	(25,770,000)
Net loss attributable to non-controlling interest									7,524,000	(8,398,000)	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.	$ 7,473,000	$ (40,264,000)	$ (39,129,000)	$ (35,388,000)	$ (34,865,000)	$ (31,737,000)	$ (28,040,000)	$ 21,811,000	(107,308,000)	(72,831,000)	(25,770,000)
Net income (loss) attributable to Endurance International Group Holdings, Inc.
Foreign currency translation adjustments									3,091,000	(597,000)	(1,281,000)
Unrealized gain (loss) on cash flow hedge									34,000	(1,351,000)	80,000
Total comprehensive loss									(104,183,000)	(74,779,000)	(26,971,000)
Eliminations
Income Statement [Abstract]
Revenue									(6,496,000)	(822,000)	(717,000)
Cost of revenue									(5,217,000)	(1,029,000)	(1,201,000)
Gross profit									(1,279,000)	207,000	484,000
Operating expense:
Sales and marketing									(3,000)	(33,000)	(33,000)
Engineering and development									0	0	0
General and administrative									(628,000)	0
General and administrative											111,000
Transaction expenses									0	0
Total operating expense									(631,000)	(33,000)	78,000
Income (loss) from operations									(648,000)	240,000	406,000
Interest expense and other income, net									0	0	0
Income (loss) before income taxes and equity earnings of unconsolidated entities									(648,000)	240,000	406,000
Income tax expense (benefit)									0	0	0
Loss before equity earnings of unconsolidated entities									(648,000)	240,000	406,000
Equity income (loss) of unconsolidated entities, net of tax									(108,101,000)	(107,248,000)	12,565,000
Net loss									107,453,000	107,488,000	(12,159,000)
Net loss attributable to non-controlling interest									0	0	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.									107,453,000	107,488,000	(12,159,000)
Net income (loss) attributable to Endurance International Group Holdings, Inc.
Foreign currency translation adjustments									0	0	0
Unrealized gain (loss) on cash flow hedge									0	0	0
Total comprehensive loss									107,453,000	107,488,000	(12,159,000)
Parent | Reportable Legal Entities
Income Statement [Abstract]
Revenue									0	0	0
Cost of revenue									0	0	0
Gross profit									0	0	0
Operating expense:
Sales and marketing									0	0	0
Engineering and development									0	0	0
General and administrative									0	0
General and administrative											0
Transaction expenses									0	0
Total operating expense									0	0	0
Income (loss) from operations									0	0	0
Interest expense and other income, net									0	0	0
Income (loss) before income taxes and equity earnings of unconsolidated entities									0	0	0
Income tax expense (benefit)									0	0	0
Loss before equity earnings of unconsolidated entities									0	0	0
Equity income (loss) of unconsolidated entities, net of tax									99,137,000	73,071,000	26,176,000
Net loss									(99,137,000)	(73,071,000)	(26,176,000)
Net loss attributable to non-controlling interest									0	0	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.									(99,137,000)	(73,071,000)	(26,176,000)
Net income (loss) attributable to Endurance International Group Holdings, Inc.
Foreign currency translation adjustments									0	0	0
Unrealized gain (loss) on cash flow hedge											0
Total comprehensive loss									(99,137,000)	(73,071,000)	(26,176,000)
Issuer | Reportable Legal Entities
Income Statement [Abstract]
Revenue									0	0	0
Cost of revenue									0	0	0
Gross profit									0	0	0
Operating expense:
Sales and marketing									0	0	0
Engineering and development									0	0	0
General and administrative									207,000	242,000
General and administrative											177,000
Transaction expenses									0	0
Total operating expense									207,000	242,000	177,000
Income (loss) from operations									(207,000)	(242,000)	(177,000)
Interest expense and other income, net									156,144,000	149,512,000	56,843,000
Income (loss) before income taxes and equity earnings of unconsolidated entities									(156,351,000)	(149,754,000)	(57,020,000)
Income tax expense (benefit)									(57,504,000)	(53,847,000)	10,320,000
Loss before equity earnings of unconsolidated entities									(98,847,000)	(95,907,000)	(67,340,000)
Equity income (loss) of unconsolidated entities, net of tax									290,000	(22,837,000)	(41,164,000)
Net loss									(99,137,000)	(73,070,000)	(26,176,000)
Net loss attributable to non-controlling interest									0	0	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.									(99,137,000)	(73,070,000)	(26,176,000)
Net income (loss) attributable to Endurance International Group Holdings, Inc.
Foreign currency translation adjustments									0	0	0
Unrealized gain (loss) on cash flow hedge									34,000	(1,351,000)	80,000
Total comprehensive loss									(99,103,000)	(74,421,000)	(26,096,000)
Guarantor Subsidiaries | Reportable Legal Entities
Income Statement [Abstract]
Revenue									1,055,013,000	978,690,000	628,266,000
Cost of revenue									515,065,000	496,267,000	349,059,000
Gross profit									539,948,000	482,423,000	279,207,000
Operating expense:
Sales and marketing									256,902,000	235,988,000	120,637,000
Engineering and development									66,051,000	72,922,000	23,019,000
General and administrative									155,339,000	128,337,000
General and administrative											80,548,000
Transaction expenses									773,000	32,284,000
Impairment of goodwill									12,129,000
Total operating expense									491,194,000	469,531,000	224,204,000
Income (loss) from operations									48,754,000	12,892,000	55,003,000
Interest expense and other income, net									1,338,000	(3,606,000)	(3,554,000)
Income (loss) before income taxes and equity earnings of unconsolidated entities									47,416,000	16,498,000	58,557,000
Income tax expense (benefit)									39,125,000	(55,953,000)	331,000
Loss before equity earnings of unconsolidated entities									8,291,000	72,451,000	58,226,000
Equity income (loss) of unconsolidated entities, net of tax									8,581,000	58,014,000	17,063,000
Net loss									(290,000)	14,437,000	41,163,000
Net loss attributable to non-controlling interest									7,524,000	(8,398,000)	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.									(7,814,000)	22,835,000	41,163,000
Net income (loss) attributable to Endurance International Group Holdings, Inc.
Foreign currency translation adjustments									0	0	0
Unrealized gain (loss) on cash flow hedge									0	0	0
Total comprehensive loss									(7,814,000)	22,835,000	41,163,000
Non-Guarantor Subsidiaries | Reportable Legal Entities
Income Statement [Abstract]
Revenue									128,350,000	133,274,000	113,766,000
Cost of revenue									94,082,000	88,753,000	77,177,000
Gross profit									34,268,000	44,521,000	36,589,000
Operating expense:
Sales and marketing									20,561,000	67,556,000	24,815,000
Engineering and development									12,721,000	14,679,000	3,688,000
General and administrative									9,054,000	14,516,000
General and administrative											10,132,000
Transaction expenses									0	0
Total operating expense									42,336,000	96,751,000	38,635,000
Income (loss) from operations									(8,068,000)	(52,230,000)	(2,046,000)
Interest expense and other income, net									(476,000)	4,544,000	(315,000)
Income (loss) before income taxes and equity earnings of unconsolidated entities									(7,592,000)	(56,774,000)	(1,731,000)
Income tax expense (benefit)									1,098,000	(58,000)	691,000
Loss before equity earnings of unconsolidated entities									(8,690,000)	(56,716,000)	(2,422,000)
Equity income (loss) of unconsolidated entities, net of tax									(17,000)	297,000	0
Net loss									(8,673,000)	(57,013,000)	(2,422,000)
Net loss attributable to non-controlling interest									0	0	0
Net income (loss) attributable to Endurance International Group Holdings, Inc.									(8,673,000)	(57,013,000)	(2,422,000)
Net income (loss) attributable to Endurance International Group Holdings, Inc.
Foreign currency translation adjustments									3,091,000	(597,000)	(1,281,000)
Unrealized gain (loss) on cash flow hedge									0	0	0
Total comprehensive loss									$ (5,582,000)	$ (57,610,000)	$ (3,703,000)

Supplemental Guarantor Finan107

Supplemental Guarantor Financial Information - Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 201,273	$ 154,961	$ 177,228
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired	0	(889,634)	(97,795)
Purchases of property and equipment	(43,062)	(37,259)	(31,243)
Cash paid for minority investment	0	(5,600)	(8,475)
Proceeds from sale of property and equipment		676	93
Proceeds from note receivable	0	0	3,454
Proceeds from sale of assets	530	676	284
Proceeds from sale of assets			191
Purchases of intangible assets	(1,966)	(27)	(76)
Net (deposits) and withdrawals of principal balances in restricted cash accounts	677	(557)	50
Net cash used in investing activities	(43,821)	(932,401)	(133,801)
Cash flows from financing activities:
Proceeds from issuance of term loan	1,693,007	1,056,178	0
Proceeds from borrowing of revolver		1,110,678	147,000
Repayment of notes payable and revolver	(1,797,634)	(176,700)	(140,500)
Payment of financing costs	(6,304)	(52,561)	0
Payment of deferred consideration	(5,433)	(51,044)	(14,991)
Payment of redeemable non-controlling interest liability	(25,000)	(33,425)	(30,543)
Principal payments on capital lease obligations	(7,390)	(5,892)	(4,822)
Proceeds from exercise of stock options	2,049	2,564	2,224
Capital investment from minority interest partner	0	2,776	0
Intercompany loans and investments	0	0	0
Net cash provided by (used in) financing activities	(146,705)	796,396	(41,632)
Net effect of exchange rate on cash and cash equivalents	2,150	1,610	(1,144)
Net increase (decrease) in cash and cash equivalents	12,897	20,566	651
Cash and cash equivalents:
Beginning of period	53,596	33,030	32,379
End of period	66,493	53,596	33,030
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities			0
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired		0	0
Purchases of property and equipment	0	0	0
Cash paid for minority investment	0	0	0
Proceeds from sale of property and equipment		0	0
Proceeds from note receivable			0
Proceeds from sale of assets	0
Proceeds from sale of assets			0
Purchases of intangible assets	0	0	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	0	0	0
Net cash used in investing activities	0	0	0
Cash flows from financing activities:
Proceeds from issuance of term loan	0
Proceeds from borrowing of revolver		0	0
Repayment of notes payable and revolver	0	0	0
Payment of financing costs	0	0	0
Payment of deferred consideration	0	0	0
Payment of redeemable non-controlling interest liability	0	0	0
Principal payments on capital lease obligations	0	0	0
Proceeds from exercise of stock options	0	0	0
Capital investment from minority interest partner	0	0
Intercompany loans and investments	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Net effect of exchange rate on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents:
Beginning of period	0	0	0
End of period	0	0	0
Parent | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	12		2
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired		0	0
Purchases of property and equipment	0	0	0
Cash paid for minority investment	0	0	0
Proceeds from sale of property and equipment		0	0
Proceeds from note receivable			0
Proceeds from sale of assets	0
Proceeds from sale of assets			0
Purchases of intangible assets	0	0	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	0	0	0
Net cash used in investing activities	0	0
Cash flows from financing activities:
Proceeds from issuance of term loan	0
Proceeds from borrowing of revolver		0	0
Repayment of notes payable and revolver	0	0	0
Payment of financing costs	0	0	0
Payment of deferred consideration	0	0	0
Payment of redeemable non-controlling interest liability	0	0	0
Principal payments on capital lease obligations	0	0	0
Proceeds from exercise of stock options	2,049	2,564	2,224
Capital investment from minority interest partner	0	0
Intercompany loans and investments	(1,972)	(2,573)	(2,215)
Net cash provided by (used in) financing activities	77	(9)	9
Net effect of exchange rate on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	89	(9)	11
Cash and cash equivalents:
Beginning of period	3	12	1
End of period	92	3	12
Issuer | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(82,189)	(71,204)	(50,147)
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired		0	0
Purchases of property and equipment	0	0	0
Cash paid for minority investment	0	0	0
Proceeds from sale of property and equipment		0	0
Proceeds from note receivable			0
Proceeds from sale of assets	0
Proceeds from sale of assets			0
Purchases of intangible assets	0	0	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	0	0	0
Net cash used in investing activities	0	0	0
Cash flows from financing activities:
Proceeds from issuance of term loan	1,693,007
Proceeds from borrowing of revolver		1,110,678	147,000
Repayment of notes payable and revolver	(1,797,634)	(176,700)	(140,500)
Payment of financing costs	(6,304)	(52,561)	0
Payment of deferred consideration	0	0	0
Payment of redeemable non-controlling interest liability	0	0	0
Principal payments on capital lease obligations	0	0	0
Proceeds from exercise of stock options	0	0	0
Capital investment from minority interest partner	0	0
Intercompany loans and investments	193,118	(810,276)	39,367
Net cash provided by (used in) financing activities	82,187	71,141	45,867
Net effect of exchange rate on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	(2)	(63)	(4,280)
Cash and cash equivalents:
Beginning of period	4	67	4,347
End of period	2	4	67
Guarantor Subsidiaries | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	284,912	256,461	220,468
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired		(889,634)	(92,376)
Purchases of property and equipment	(38,731)	(32,528)	(28,058)
Cash paid for minority investment	0	(5,600)	(8,475)
Proceeds from sale of property and equipment		674	51
Proceeds from note receivable			3,454
Proceeds from sale of assets	530
Proceeds from sale of assets			191
Purchases of intangible assets	(1,932)	(7)	(76)
Net (deposits) and withdrawals of principal balances in restricted cash accounts	148	(347)	(296)
Net cash used in investing activities	(39,985)	(927,442)	(125,585)
Cash flows from financing activities:
Proceeds from issuance of term loan	0
Proceeds from borrowing of revolver		0	0
Repayment of notes payable and revolver	0	0	0
Payment of financing costs	0	0	0
Payment of deferred consideration	(4,550)	(50,375)	(14,503)
Payment of redeemable non-controlling interest liability	(25,000)	(33,425)	(30,543)
Principal payments on capital lease obligations	(7,390)	(5,892)	(4,822)
Proceeds from exercise of stock options	0	0	0
Capital investment from minority interest partner	0	0
Intercompany loans and investments	(192,548)	778,421	(42,431)
Net cash provided by (used in) financing activities	(229,488)	688,729	(92,299)
Net effect of exchange rate on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	15,439	17,748	2,584
Cash and cash equivalents:
Beginning of period	39,034	21,286	18,702
End of period	54,473	39,034	21,286
Non-Guarantor Subsidiaries | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(1,462)	(30,296)	6,905
Cash flows from investing activities:
Businesses acquired in purchase transaction, net of cash acquired		0	(5,419)
Purchases of property and equipment	(4,331)	(4,731)	(3,185)
Cash paid for minority investment	0	0	0
Proceeds from sale of property and equipment		2	42
Proceeds from note receivable			0
Proceeds from sale of assets	0
Proceeds from sale of assets			0
Purchases of intangible assets	(34)	(20)	0
Net (deposits) and withdrawals of principal balances in restricted cash accounts	529	(210)	346
Net cash used in investing activities	(3,836)	(4,959)	(8,216)
Cash flows from financing activities:
Proceeds from issuance of term loan	0
Proceeds from borrowing of revolver		0	0
Repayment of notes payable and revolver	0	0	0
Payment of financing costs	0	0	0
Payment of deferred consideration	(883)	(669)	(488)
Payment of redeemable non-controlling interest liability	0	0	0
Principal payments on capital lease obligations	0	0	0
Proceeds from exercise of stock options	0	0	0
Capital investment from minority interest partner	0	2,776
Intercompany loans and investments	1,402	34,428	5,279
Net cash provided by (used in) financing activities	519	36,535	4,791
Net effect of exchange rate on cash and cash equivalents	2,150	1,610	(1,144)
Net increase (decrease) in cash and cash equivalents	(2,629)	2,890	2,336
Cash and cash equivalents:
Beginning of period	14,555	11,665	9,329
End of period	$ 11,926	$ 14,555	11,665
Parent [Member] | Reportable Legal Entities
Cash flows from investing activities:
Net cash used in investing activities			$ 0